diff --git a/dlls/jscript/array.c b/dlls/jscript/array.c
index be98b8e975f..54dc3470433 100644
--- a/dlls/jscript/array.c
+++ b/dlls/jscript/array.c
@@ -127,20 +127,15 @@ static HRESULT Array_length(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISP
         V_I4(retv) = This->length;
         break;
     case DISPATCH_PROPERTYPUT: {
-        VARIANT num;
         DOUBLE len = -1;
         DWORD i;
         HRESULT hres;
 
-        hres = to_number(ctx, get_arg(dp, 0), ei, &num);
+        hres = to_number(ctx, get_arg(dp, 0), ei, &len);
         if(FAILED(hres))
             return hres;
 
-        if(V_VT(&num) == VT_I4)
-            len = V_I4(&num);
-        else
-            len = floor(V_R8(&num));
-
+        len = floor(len);
         if(len!=(DWORD)len)
             return throw_range_error(ctx, ei, JS_E_INVALID_LENGTH, NULL);
 
@@ -573,7 +568,6 @@ static HRESULT Array_slice(script_ctx_t *ctx, vdisp_t *vthis, WORD flags, DISPPA
         VARIANT *retv, jsexcept_t *ei)
 {
     jsdisp_t *arr, *jsthis;
-    VARIANT v;
     DOUBLE range;
     DWORD length, start, end, idx;
     HRESULT hres;
@@ -585,15 +579,11 @@ static HRESULT Array_slice(script_ctx_t *ctx, vdisp_t *vthis, WORD flags, DISPPA
         return hres;
 
     if(arg_cnt(dp)) {
-        hres = to_number(ctx, get_arg(dp, 0), ei, &v);
+        hres = to_number(ctx, get_arg(dp, 0), ei, &range);
         if(FAILED(hres))
             return hres;
 
-        if(V_VT(&v) == VT_I4)
-            range = V_I4(&v);
-        else
-            range = floor(V_R8(&v));
-
+        range = floor(range);
         if(-range>length || isnan(range)) start = 0;
         else if(range < 0) start = range+length;
         else if(range <= length) start = range;
@@ -602,15 +592,11 @@ static HRESULT Array_slice(script_ctx_t *ctx, vdisp_t *vthis, WORD flags, DISPPA
     else start = 0;
 
     if(arg_cnt(dp)>1) {
-        hres = to_number(ctx, get_arg(dp, 1), ei, &v);
+        hres = to_number(ctx, get_arg(dp, 1), ei, &range);
         if(FAILED(hres))
             return hres;
 
-        if(V_VT(&v) == VT_I4)
-            range = V_I4(&v);
-        else
-            range = floor(V_R8(&v));
-
+        range = floor(range);
         if(-range>length) end = 0;
         else if(range < 0) end = range+length;
         else if(range <= length) end = range;
@@ -623,6 +609,8 @@ static HRESULT Array_slice(script_ctx_t *ctx, vdisp_t *vthis, WORD flags, DISPPA
         return hres;
 
     for(idx=start; idx<end; idx++) {
+        VARIANT v;
+
         hres = jsdisp_get_idx(jsthis, idx, &v, ei);
         if(hres == DISP_E_UNKNOWNNAME)
             continue;
@@ -653,7 +641,7 @@ static HRESULT sort_cmp(script_ctx_t *ctx, jsdisp_t *cmp_func, VARIANT *v1, VARI
     if(cmp_func) {
         VARIANTARG args[2];
         DISPPARAMS dp = {args, NULL, 2, 0};
-        VARIANT tmp;
+        double n;
         VARIANT res;
 
         args[0] = *v2;
@@ -663,15 +651,14 @@ static HRESULT sort_cmp(script_ctx_t *ctx, jsdisp_t *cmp_func, VARIANT *v1, VARI
         if(FAILED(hres))
             return hres;
 
-        hres = to_number(ctx, &res, ei, &tmp);
+        hres = to_number(ctx, &res, ei, &n);
         VariantClear(&res);
         if(FAILED(hres))
             return hres;
 
-        if(V_VT(&tmp) == VT_I4)
-            *cmp = V_I4(&tmp);
-        else
-            *cmp = V_R8(&tmp) > 0.0 ? 1 : -1;
+        if(n == 0)
+            *cmp = 0;
+        *cmp = n > 0.0 ? 1 : -1;
     }else if(V_VT(v1) == VT_EMPTY) {
         *cmp = V_VT(v2) == VT_EMPTY ? 0 : 1;
     }else if(V_VT(v2) == VT_EMPTY) {
diff --git a/dlls/jscript/date.c b/dlls/jscript/date.c
index 6f9c800b723..4ca6e81df75 100644
--- a/dlls/jscript/date.c
+++ b/dlls/jscript/date.c
@@ -1366,7 +1366,7 @@ static HRESULT Date_getTimezoneOffset(script_ctx_t *ctx, vdisp_t *jsthis, WORD f
 static HRESULT Date_setTime(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
         VARIANT *retv, jsexcept_t *ei)
 {
-    VARIANT v;
+    double n;
     HRESULT hres;
     DateInstance *date;
 
@@ -1378,11 +1378,11 @@ static HRESULT Date_setTime(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISP
     if(!arg_cnt(dp))
         return throw_type_error(ctx, ei, JS_E_MISSING_ARG, NULL);
 
-    hres = to_number(ctx, get_arg(dp, 0), ei, &v);
+    hres = to_number(ctx, get_arg(dp, 0), ei, &n);
     if(FAILED(hres))
         return hres;
 
-    date->time = time_clip(num_val(&v));
+    date->time = time_clip(n);
 
     if(retv)
         num_set_val(retv, date->time);
@@ -1394,10 +1394,9 @@ static HRESULT Date_setTime(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISP
 static HRESULT Date_setMilliseconds(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
         VARIANT *retv, jsexcept_t *ei)
 {
-    VARIANT v;
-    HRESULT hres;
     DateInstance *date;
-    DOUBLE t;
+    double n, t;
+    HRESULT hres;
 
     TRACE("\n");
 
@@ -1407,13 +1406,13 @@ static HRESULT Date_setMilliseconds(script_ctx_t *ctx, vdisp_t *jsthis, WORD fla
     if(!arg_cnt(dp))
         return throw_type_error(ctx, ei, JS_E_MISSING_ARG, NULL);
 
-    hres = to_number(ctx, get_arg(dp, 0), ei, &v);
+    hres = to_number(ctx, get_arg(dp, 0), ei, &n);
     if(FAILED(hres))
         return hres;
 
     t = local_time(date->time, date);
     t = make_date(day(t), make_time(hour_from_time(t), min_from_time(t),
-                sec_from_time(t), num_val(&v)));
+                sec_from_time(t), n));
     date->time = time_clip(utc(t, date));
 
     if(retv)
@@ -1426,10 +1425,9 @@ static HRESULT Date_setMilliseconds(script_ctx_t *ctx, vdisp_t *jsthis, WORD fla
 static HRESULT Date_setUTCMilliseconds(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
         VARIANT *retv, jsexcept_t *ei)
 {
-    VARIANT v;
-    HRESULT hres;
     DateInstance *date;
-    DOUBLE t;
+    double n, t;
+    HRESULT hres;
 
     TRACE("\n");
 
@@ -1439,13 +1437,13 @@ static HRESULT Date_setUTCMilliseconds(script_ctx_t *ctx, vdisp_t *jsthis, WORD
     if(!arg_cnt(dp))
         return throw_type_error(ctx, ei, JS_E_MISSING_ARG, NULL);
 
-    hres = to_number(ctx, get_arg(dp, 0), ei, &v);
+    hres = to_number(ctx, get_arg(dp, 0), ei, &n);
     if(FAILED(hres))
         return hres;
 
     t = date->time;
     t = make_date(day(t), make_time(hour_from_time(t), min_from_time(t),
-                sec_from_time(t), num_val(&v)));
+                sec_from_time(t), n));
     date->time = time_clip(t);
 
     if(retv)
@@ -1458,10 +1456,9 @@ static HRESULT Date_setUTCMilliseconds(script_ctx_t *ctx, vdisp_t *jsthis, WORD
 static HRESULT Date_setSeconds(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
         VARIANT *retv, jsexcept_t *ei)
 {
-    VARIANT v;
-    HRESULT hres;
     DateInstance *date;
-    DOUBLE t, sec, ms;
+    double t, sec, ms;
+    HRESULT hres;
 
     TRACE("\n");
 
@@ -1473,18 +1470,17 @@ static HRESULT Date_setSeconds(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, D
 
     t = local_time(date->time, date);
 
-    hres = to_number(ctx, get_arg(dp, 0), ei, &v);
+    hres = to_number(ctx, get_arg(dp, 0), ei, &sec);
     if(FAILED(hres))
         return hres;
-    sec = num_val(&v);
 
     if(arg_cnt(dp) > 1) {
-        hres = to_number(ctx, get_arg(dp, 1), ei, &v);
+        hres = to_number(ctx, get_arg(dp, 1), ei, &ms);
         if(FAILED(hres))
             return hres;
-        ms = num_val(&v);
+    }else {
+        ms = ms_from_time(t);
     }
-    else ms = ms_from_time(t);
 
     t = make_date(day(t), make_time(hour_from_time(t),
                 min_from_time(t), sec, ms));
@@ -1500,10 +1496,9 @@ static HRESULT Date_setSeconds(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, D
 static HRESULT Date_setUTCSeconds(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
         VARIANT *retv, jsexcept_t *ei)
 {
-    VARIANT v;
-    HRESULT hres;
     DateInstance *date;
-    DOUBLE t, sec, ms;
+    double t, sec, ms;
+    HRESULT hres;
 
     TRACE("\n");
 
@@ -1515,18 +1510,17 @@ static HRESULT Date_setUTCSeconds(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags
 
     t = date->time;
 
-    hres = to_number(ctx, get_arg(dp, 0), ei, &v);
+    hres = to_number(ctx, get_arg(dp, 0), ei, &sec);
     if(FAILED(hres))
         return hres;
-    sec = num_val(&v);
 
     if(arg_cnt(dp) > 1) {
-        hres = to_number(ctx, get_arg(dp, 1), ei, &v);
+        hres = to_number(ctx, get_arg(dp, 1), ei, &ms);
         if(FAILED(hres))
             return hres;
-        ms = num_val(&v);
+    }else {
+        ms = ms_from_time(t);
     }
-    else ms = ms_from_time(t);
 
     t = make_date(day(t), make_time(hour_from_time(t),
                 min_from_time(t), sec, ms));
@@ -1542,10 +1536,9 @@ static HRESULT Date_setUTCSeconds(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags
 static HRESULT Date_setMinutes(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
         VARIANT *retv, jsexcept_t *ei)
 {
-    VARIANT v;
-    HRESULT hres;
     DateInstance *date;
-    DOUBLE t, min, sec, ms;
+    double t, min, sec, ms;
+    HRESULT hres;
 
     TRACE("\n");
 
@@ -1557,26 +1550,25 @@ static HRESULT Date_setMinutes(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, D
 
     t = local_time(date->time, date);
 
-    hres = to_number(ctx, get_arg(dp, 0), ei, &v);
+    hres = to_number(ctx, get_arg(dp, 0), ei, &min);
     if(FAILED(hres))
         return hres;
-    min = num_val(&v);
 
     if(arg_cnt(dp) > 1) {
-        hres = to_number(ctx, get_arg(dp, 1), ei, &v);
+        hres = to_number(ctx, get_arg(dp, 1), ei, &sec);
         if(FAILED(hres))
             return hres;
-        sec = num_val(&v);
+    }else {
+        sec = sec_from_time(t);
     }
-    else sec = sec_from_time(t);
 
     if(arg_cnt(dp) > 2) {
-        hres = to_number(ctx, get_arg(dp, 2), ei, &v);
+        hres = to_number(ctx, get_arg(dp, 2), ei, &ms);
         if(FAILED(hres))
             return hres;
-        ms = num_val(&v);
+    }else {
+        ms = ms_from_time(t);
     }
-    else ms = ms_from_time(t);
 
     t = make_date(day(t), make_time(hour_from_time(t),
                 min, sec, ms));
@@ -1592,10 +1584,9 @@ static HRESULT Date_setMinutes(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, D
 static HRESULT Date_setUTCMinutes(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
         VARIANT *retv, jsexcept_t *ei)
 {
-    VARIANT v;
-    HRESULT hres;
     DateInstance *date;
-    DOUBLE t, min, sec, ms;
+    double t, min, sec, ms;
+    HRESULT hres;
 
     TRACE("\n");
 
@@ -1607,26 +1598,25 @@ static HRESULT Date_setUTCMinutes(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags
 
     t = date->time;
 
-    hres = to_number(ctx, get_arg(dp, 0), ei, &v);
+    hres = to_number(ctx, get_arg(dp, 0), ei, &min);
     if(FAILED(hres))
         return hres;
-    min = num_val(&v);
 
     if(arg_cnt(dp) > 1) {
-        hres = to_number(ctx, get_arg(dp, 1), ei, &v);
+        hres = to_number(ctx, get_arg(dp, 1), ei, &sec);
         if(FAILED(hres))
             return hres;
-        sec = num_val(&v);
+    }else {
+        sec = sec_from_time(t);
     }
-    else sec = sec_from_time(t);
 
     if(arg_cnt(dp) > 2) {
-        hres = to_number(ctx, get_arg(dp, 2), ei, &v);
+        hres = to_number(ctx, get_arg(dp, 2), ei, &ms);
         if(FAILED(hres))
             return hres;
-        ms = num_val(&v);
+    }else {
+        ms = ms_from_time(t);
     }
-    else ms = ms_from_time(t);
 
     t = make_date(day(t), make_time(hour_from_time(t),
                 min, sec, ms));
@@ -1642,10 +1632,9 @@ static HRESULT Date_setUTCMinutes(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags
 static HRESULT Date_setHours(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
         VARIANT *retv, jsexcept_t *ei)
 {
-    VARIANT v;
-    HRESULT hres;
     DateInstance *date;
-    DOUBLE t, hour, min, sec, ms;
+    double t, hour, min, sec, ms;
+    HRESULT hres;
 
     TRACE("\n");
 
@@ -1657,34 +1646,33 @@ static HRESULT Date_setHours(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DIS
 
     t = local_time(date->time, date);
 
-    hres = to_number(ctx, get_arg(dp, 0), ei, &v);
+    hres = to_number(ctx, get_arg(dp, 0), ei, &hour);
     if(FAILED(hres))
         return hres;
-    hour = num_val(&v);
 
     if(arg_cnt(dp) > 1) {
-        hres = to_number(ctx, get_arg(dp, 1), ei, &v);
+        hres = to_number(ctx, get_arg(dp, 1), ei, &min);
         if(FAILED(hres))
             return hres;
-        min = num_val(&v);
+    }else {
+        min = min_from_time(t);
     }
-    else min = min_from_time(t);
 
     if(arg_cnt(dp) > 2) {
-        hres = to_number(ctx, get_arg(dp, 2), ei, &v);
+        hres = to_number(ctx, get_arg(dp, 2), ei, &sec);
         if(FAILED(hres))
             return hres;
-        sec = num_val(&v);
+    }else {
+        sec = sec_from_time(t);
     }
-    else sec = sec_from_time(t);
 
     if(arg_cnt(dp) > 3) {
-        hres = to_number(ctx, get_arg(dp, 3), ei, &v);
+        hres = to_number(ctx, get_arg(dp, 3), ei, &ms);
         if(FAILED(hres))
             return hres;
-        ms = num_val(&v);
+    }else {
+        ms = ms_from_time(t);
     }
-    else ms = ms_from_time(t);
 
     t = make_date(day(t), make_time(hour, min, sec, ms));
     date->time = time_clip(utc(t, date));
@@ -1700,9 +1688,8 @@ static HRESULT Date_setUTCHours(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags,
         VARIANT *retv, jsexcept_t *ei)
 {
     DateInstance *date;
-    VARIANT v;
+    double t, hour, min, sec, ms;
     HRESULT hres;
-    DOUBLE t, hour, min, sec, ms;
 
     TRACE("\n");
 
@@ -1714,34 +1701,33 @@ static HRESULT Date_setUTCHours(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags,
 
     t = date->time;
 
-    hres = to_number(ctx, get_arg(dp, 0), ei, &v);
+    hres = to_number(ctx, get_arg(dp, 0), ei, &hour);
     if(FAILED(hres))
         return hres;
-    hour = num_val(&v);
 
     if(arg_cnt(dp) > 1) {
-        hres = to_number(ctx, get_arg(dp, 1), ei, &v);
+        hres = to_number(ctx, get_arg(dp, 1), ei, &min);
         if(FAILED(hres))
             return hres;
-        min = num_val(&v);
+    }else {
+        min = min_from_time(t);
     }
-    else min = min_from_time(t);
 
     if(arg_cnt(dp) > 2) {
-        hres = to_number(ctx, get_arg(dp, 2), ei, &v);
+        hres = to_number(ctx, get_arg(dp, 2), ei, &sec);
         if(FAILED(hres))
             return hres;
-        sec = num_val(&v);
+    }else {
+        sec = sec_from_time(t);
     }
-    else sec = sec_from_time(t);
 
     if(arg_cnt(dp) > 3) {
-        hres = to_number(ctx, get_arg(dp, 3), ei, &v);
+        hres = to_number(ctx, get_arg(dp, 3), ei, &ms);
         if(FAILED(hres))
             return hres;
-        ms = num_val(&v);
+    }else {
+        ms = ms_from_time(t);
     }
-    else ms = ms_from_time(t);
 
     t = make_date(day(t), make_time(hour, min, sec, ms));
     date->time = time_clip(t);
@@ -1756,10 +1742,9 @@ static HRESULT Date_setUTCHours(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags,
 static HRESULT Date_setDate(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
         VARIANT *retv, jsexcept_t *ei)
 {
-    VARIANT v;
-    HRESULT hres;
     DateInstance *date;
-    DOUBLE t;
+    double t, n;
+    HRESULT hres;
 
     TRACE("\n");
 
@@ -1769,13 +1754,12 @@ static HRESULT Date_setDate(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISP
     if(!arg_cnt(dp))
         return throw_type_error(ctx, ei, JS_E_MISSING_ARG, NULL);
 
-    hres = to_number(ctx, get_arg(dp, 0), ei, &v);
+    hres = to_number(ctx, get_arg(dp, 0), ei, &n);
     if(FAILED(hres))
         return hres;
 
     t = local_time(date->time, date);
-    t = make_date(make_day(year_from_time(t), month_from_time(t),
-                num_val(&v)), time_within_day(t));
+    t = make_date(make_day(year_from_time(t), month_from_time(t), n), time_within_day(t));
     date->time = time_clip(utc(t, date));
 
     if(retv)
@@ -1788,10 +1772,9 @@ static HRESULT Date_setDate(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISP
 static HRESULT Date_setUTCDate(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
         VARIANT *retv, jsexcept_t *ei)
 {
-    VARIANT v;
-    HRESULT hres;
     DateInstance *date;
-    DOUBLE t;
+    double t, n;
+    HRESULT hres;
 
     TRACE("\n");
 
@@ -1801,13 +1784,12 @@ static HRESULT Date_setUTCDate(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, D
     if(!arg_cnt(dp))
         return throw_type_error(ctx, ei, JS_E_MISSING_ARG, NULL);
 
-    hres = to_number(ctx, get_arg(dp, 0), ei, &v);
+    hres = to_number(ctx, get_arg(dp, 0), ei, &n);
     if(FAILED(hres))
         return hres;
 
     t = date->time;
-    t = make_date(make_day(year_from_time(t), month_from_time(t),
-                num_val(&v)), time_within_day(t));
+    t = make_date(make_day(year_from_time(t), month_from_time(t), n), time_within_day(t));
     date->time = time_clip(t);
 
     if(retv)
@@ -1820,10 +1802,9 @@ static HRESULT Date_setUTCDate(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, D
 static HRESULT Date_setMonth(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
         VARIANT *retv, jsexcept_t *ei)
 {
-    VARIANT v;
-    HRESULT hres;
     DateInstance *date;
     DOUBLE t, month, ddate;
+    HRESULT hres;
 
     TRACE("\n");
 
@@ -1835,18 +1816,17 @@ static HRESULT Date_setMonth(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DIS
 
     t = local_time(date->time, date);
 
-    hres = to_number(ctx, get_arg(dp, 0), ei, &v);
+    hres = to_number(ctx, get_arg(dp, 0), ei, &month);
     if(FAILED(hres))
         return hres;
-    month = num_val(&v);
 
     if(arg_cnt(dp) > 1) {
-        hres = to_number(ctx, get_arg(dp, 1), ei, &v);
+        hres = to_number(ctx, get_arg(dp, 1), ei, &ddate);
         if(FAILED(hres))
             return hres;
-        ddate = num_val(&v);
+    }else {
+        ddate = date_from_time(t);
     }
-    else ddate = date_from_time(t);
 
     t = make_date(make_day(year_from_time(t), month, ddate),
             time_within_day(t));
@@ -1862,10 +1842,9 @@ static HRESULT Date_setMonth(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DIS
 static HRESULT Date_setUTCMonth(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
         VARIANT *retv, jsexcept_t *ei)
 {
-    VARIANT v;
-    HRESULT hres;
     DateInstance *date;
-    DOUBLE t, month, ddate;
+    double t, month, ddate;
+    HRESULT hres;
 
     TRACE("\n");
 
@@ -1877,18 +1856,17 @@ static HRESULT Date_setUTCMonth(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags,
 
     t = date->time;
 
-    hres = to_number(ctx, get_arg(dp, 0), ei, &v);
+    hres = to_number(ctx, get_arg(dp, 0), ei, &month);
     if(FAILED(hres))
         return hres;
-    month = num_val(&v);
 
     if(arg_cnt(dp) > 1) {
-        hres = to_number(ctx, get_arg(dp, 1), ei, &v);
+        hres = to_number(ctx, get_arg(dp, 1), ei, &ddate);
         if(FAILED(hres))
             return hres;
-        ddate = num_val(&v);
+    }else {
+        ddate = date_from_time(t);
     }
-    else ddate = date_from_time(t);
 
     t = make_date(make_day(year_from_time(t), month, ddate),
             time_within_day(t));
@@ -1904,10 +1882,9 @@ static HRESULT Date_setUTCMonth(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags,
 static HRESULT Date_setFullYear(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
         VARIANT *retv, jsexcept_t *ei)
 {
-    VARIANT v;
-    HRESULT hres;
     DateInstance *date;
-    DOUBLE t, year, month, ddate;
+    double t, year, month, ddate;
+    HRESULT hres;
 
     TRACE("\n");
 
@@ -1919,26 +1896,25 @@ static HRESULT Date_setFullYear(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags,
 
     t = local_time(date->time, date);
 
-    hres = to_number(ctx, get_arg(dp, 0), ei, &v);
+    hres = to_number(ctx, get_arg(dp, 0), ei, &year);
     if(FAILED(hres))
         return hres;
-    year = num_val(&v);
 
     if(arg_cnt(dp) > 1) {
-        hres = to_number(ctx, get_arg(dp, 1), ei, &v);
+        hres = to_number(ctx, get_arg(dp, 1), ei, &month);
         if(FAILED(hres))
             return hres;
-        month = num_val(&v);
+    }else {
+        month = month_from_time(t);
     }
-    else month = month_from_time(t);
 
     if(arg_cnt(dp) > 2) {
-        hres = to_number(ctx, get_arg(dp, 2), ei, &v);
+        hres = to_number(ctx, get_arg(dp, 2), ei, &ddate);
         if(FAILED(hres))
             return hres;
-        ddate = num_val(&v);
+    }else {
+        ddate = date_from_time(t);
     }
-    else ddate = date_from_time(t);
 
     t = make_date(make_day(year, month, ddate), time_within_day(t));
     date->time = time_clip(utc(t, date));
@@ -1953,10 +1929,9 @@ static HRESULT Date_setFullYear(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags,
 static HRESULT Date_setUTCFullYear(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
         VARIANT *retv, jsexcept_t *ei)
 {
-    VARIANT v;
-    HRESULT hres;
     DateInstance *date;
-    DOUBLE t, year, month, ddate;
+    double t, year, month, ddate;
+    HRESULT hres;
 
     TRACE("\n");
 
@@ -1968,26 +1943,25 @@ static HRESULT Date_setUTCFullYear(script_ctx_t *ctx, vdisp_t *jsthis, WORD flag
 
     t = date->time;
 
-    hres = to_number(ctx, get_arg(dp, 0), ei, &v);
+    hres = to_number(ctx, get_arg(dp, 0), ei, &year);
     if(FAILED(hres))
         return hres;
-    year = num_val(&v);
 
     if(arg_cnt(dp) > 1) {
-        hres = to_number(ctx, get_arg(dp, 1), ei, &v);
+        hres = to_number(ctx, get_arg(dp, 1), ei, &month);
         if(FAILED(hres))
             return hres;
-        month = num_val(&v);
+    }else {
+        month = month_from_time(t);
     }
-    else month = month_from_time(t);
 
     if(arg_cnt(dp) > 2) {
-        hres = to_number(ctx, get_arg(dp, 2), ei, &v);
+        hres = to_number(ctx, get_arg(dp, 2), ei, &ddate);
         if(FAILED(hres))
             return hres;
-        ddate = num_val(&v);
+    }else {
+        ddate = date_from_time(t);
     }
-    else ddate = date_from_time(t);
 
     t = make_date(make_day(year, month, ddate), time_within_day(t));
     date->time = time_clip(t);
@@ -2030,7 +2004,6 @@ static HRESULT Date_setYear(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISP
 {
     DateInstance *date;
     DOUBLE t, year;
-    VARIANT v;
     HRESULT hres;
 
     TRACE("\n");
@@ -2043,11 +2016,10 @@ static HRESULT Date_setYear(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISP
 
     t = local_time(date->time, date);
 
-    hres = to_number(ctx, get_arg(dp, 0), ei, &v);
+    hres = to_number(ctx, get_arg(dp, 0), ei, &year);
     if(FAILED(hres))
         return hres;
 
-    year = num_val(&v);
     if(isnan(year)) {
         date->time = year;
         if(retv)
@@ -2170,7 +2142,7 @@ static HRESULT create_date(script_ctx_t *ctx, jsdisp_t *object_prototype, DOUBLE
     return S_OK;
 }
 
-static inline HRESULT date_parse(BSTR input, VARIANT *retv) {
+static inline HRESULT date_parse(BSTR input, double *ret) {
     static const DWORD string_ids[] = { LOCALE_SMONTHNAME12, LOCALE_SMONTHNAME11,
         LOCALE_SMONTHNAME10, LOCALE_SMONTHNAME9, LOCALE_SMONTHNAME8,
         LOCALE_SMONTHNAME7, LOCALE_SMONTHNAME6, LOCALE_SMONTHNAME5,
@@ -2191,15 +2163,15 @@ static inline HRESULT date_parse(BSTR input, VARIANT *retv) {
     DateInstance di;
     DWORD lcid_en;
 
-    if(retv) num_set_nan(retv);
-
     input_len = SysStringLen(input);
     for(i=0; i<input_len; i++) {
         if(input[i] == '(') nest_level++;
         else if(input[i] == ')') {
             nest_level--;
-            if(nest_level<0)
+            if(nest_level<0) {
+                *ret = ret_nan();
                 return S_OK;
+            }
         }
         else if(!nest_level) parse_len++;
     }
@@ -2406,8 +2378,7 @@ static inline HRESULT date_parse(BSTR input, VARIANT *retv) {
         }
     }
 
-    if(retv && i==parse_len && set_year && set_month
-            && set_day && (!set_am || hour<13)) {
+    if(i == parse_len && set_year && set_month && set_day && (!set_am || hour<13)) {
         if(set_am) {
             if(hour == 12) hour = 0;
             if(!am) hour += 12;
@@ -2416,11 +2387,13 @@ static inline HRESULT date_parse(BSTR input, VARIANT *retv) {
         if(!ad) year = -year+1;
         else if(year<100) year += 1900;
 
-        V_VT(retv) = VT_R8;
-        V_R8(retv) = time_clip(make_date(make_day(year, month, day),
+        *ret = time_clip(make_date(make_day(year, month, day),
                     make_time(hour+hour_adjust, min, sec, ms)) + offset*MS_PER_MINUTE);
 
-        if(set_hour_adjust) V_R8(retv) = utc(V_R8(retv), &di);
+        if(set_hour_adjust)
+            *ret = utc(*ret, &di);
+    }else {
+        *ret = ret_nan();
     }
 
     for(i=0; i<sizeof(string_ids)/sizeof(DWORD); i++)
@@ -2434,6 +2407,7 @@ static HRESULT DateConstr_parse(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags,
         VARIANT *retv, jsexcept_t *ei)
 {
     BSTR parse_str;
+    double n;
     HRESULT hres;
 
     TRACE("\n");
@@ -2448,16 +2422,18 @@ static HRESULT DateConstr_parse(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags,
     if(FAILED(hres))
         return hres;
 
-    hres = date_parse(parse_str, retv);
-
+    hres = date_parse(parse_str, &n);
     SysFreeString(parse_str);
-    return hres;
+    if(FAILED(hres))
+        return hres;
+
+    num_set_val(retv, n);
+    return S_OK;
 }
 
 static HRESULT date_utc(script_ctx_t *ctx, DISPPARAMS *dp, VARIANT *retv, jsexcept_t *ei)
 {
-    VARIANT year, month, vdate, hours, minutes, seconds, ms;
-    DOUBLE y;
+    double year, month, vdate, hours, minutes, seconds, ms;
     int arg_no = arg_cnt(dp);
     HRESULT hres;
 
@@ -2467,78 +2443,65 @@ static HRESULT date_utc(script_ctx_t *ctx, DISPPARAMS *dp, VARIANT *retv, jsexce
         hres = to_number(ctx, get_arg(dp, 0), ei, &year);
         if(FAILED(hres))
             return hres;
-        y = num_val(&year);
-        if(0<=y && y<=99)
-            y += 1900;
+        if(0 <= year && year <= 99)
+            year += 1900;
+    }else {
+        year = 1900;
     }
-    else y = 1900;
 
     if(arg_no>1) {
         hres = to_number(ctx, get_arg(dp, 1), ei, &month);
         if(FAILED(hres))
             return hres;
-    }
-    else {
-        V_VT(&month) = VT_R8;
-        V_R8(&month) = 0;
+    }else {
+        month = 0;
     }
 
     if(arg_no>2) {
         hres = to_number(ctx, get_arg(dp, 2), ei, &vdate);
         if(FAILED(hres))
             return hres;
-    }
-    else {
-        V_VT(&vdate) = VT_R8;
-        V_R8(&vdate) = 1;
+    }else {
+        vdate = 1;
     }
 
     if(arg_no>3) {
         hres = to_number(ctx, get_arg(dp, 3), ei, &hours);
         if(FAILED(hres))
             return hres;
-    }
-    else {
-        V_VT(&hours) = VT_R8;
-        V_R8(&hours) = 0;
+    }else {
+        hours = 0;
     }
 
     if(arg_no>4) {
         hres = to_number(ctx, get_arg(dp, 4), ei, &minutes);
         if(FAILED(hres))
             return hres;
-    }
-    else {
-        V_VT(&minutes) = VT_R8;
-        V_R8(&minutes) = 0;
+    }else {
+        minutes = 0;
     }
 
     if(arg_no>5) {
         hres = to_number(ctx, get_arg(dp, 5), ei, &seconds);
         if(FAILED(hres))
             return hres;
-    }
-    else {
-        V_VT(&seconds) = VT_R8;
-        V_R8(&seconds) = 0;
+    }else {
+        seconds = 0;
     }
 
     if(arg_no>6) {
         hres = to_number(ctx, get_arg(dp, 6), ei, &ms);
         if(FAILED(hres))
             return hres;
-    }
-    else {
-        V_VT(&ms) = VT_R8;
-        V_R8(&ms) = 0;
+    } else {
+        ms = 0;
     }
 
     if(retv) {
         V_VT(retv) = VT_R8;
         V_R8(retv) = time_clip(make_date(
-                    make_day(y, num_val(&month), num_val(&vdate)),
-                    make_time(num_val(&hours), num_val(&minutes),
-                    num_val(&seconds), num_val(&ms))));
+                    make_day(year, month, vdate),
+                    make_time(hours, minutes,seconds, ms)));
     }
 
     return S_OK;
@@ -2580,22 +2543,23 @@ static HRESULT DateConstr_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags,
 
         /* ECMA-262 3rd Edition    15.9.3.2 */
         case 1: {
-            VARIANT prim, num;
+            VARIANT prim;
+            double n;
 
             hres = to_primitive(ctx, get_arg(dp,0), ei, &prim, NO_HINT);
             if(FAILED(hres))
                 return hres;
 
             if(V_VT(&prim) == VT_BSTR)
-                hres = date_parse(V_BSTR(&prim), &num);
+                hres = date_parse(V_BSTR(&prim), &n);
             else
-                hres = to_number(ctx, &prim, ei, &num);
+                hres = to_number(ctx, &prim, ei, &n);
 
             VariantClear(&prim);
             if(FAILED(hres))
                 return hres;
 
-            hres = create_date(ctx, NULL, time_clip(num_val(&num)), &date);
+            hres = create_date(ctx, NULL, time_clip(n), &date);
             if(FAILED(hres))
                 return hres;
             break;
diff --git a/dlls/jscript/engine.c b/dlls/jscript/engine.c
index 892cb1e75b6..c4259b9349d 100644
--- a/dlls/jscript/engine.c
+++ b/dlls/jscript/engine.c
@@ -148,12 +148,17 @@ static void stack_popn(exec_ctx_t *ctx, unsigned n)
 static HRESULT stack_pop_number(exec_ctx_t *ctx, VARIANT *r)
 {
     VARIANT *v;
+    double n;
     HRESULT hres;
 
     v = stack_pop(ctx);
-    hres = to_number(ctx->script, v, ctx->ei, r);
+    hres = to_number(ctx->script, v, ctx->ei, &n);
     VariantClear(v);
-    return hres;
+    if(FAILED(hres))
+        return hres;
+
+    num_set_val(r, n);
+    return S_OK;
 }
 
 static HRESULT stack_pop_object(exec_ctx_t *ctx, IDispatch **r)
@@ -1526,13 +1531,13 @@ static HRESULT add_eval(script_ctx_t *ctx, VARIANT *lval, VARIANT *rval, jsexcep
         if(V_VT(&r) != VT_BSTR)
             SysFreeString(rstr);
     }else {
-        VARIANT nl, nr;
+        double nl, nr;
 
         hres = to_number(ctx, &l, ei, &nl);
         if(SUCCEEDED(hres)) {
             hres = to_number(ctx, &r, ei, &nr);
             if(SUCCEEDED(hres))
-                num_set_val(retv, num_val(&nl) + num_val(&nr));
+                num_set_val(retv, nl + nr);
         }
     }
 
@@ -1872,18 +1877,19 @@ static HRESULT interp_minus(exec_ctx_t *ctx)
 /* ECMA-262 3rd Edition    11.4.6 */
 static HRESULT interp_tonum(exec_ctx_t *ctx)
 {
-    VARIANT *v, num;
+    VARIANT *v;
+    double n;
     HRESULT hres;
 
     TRACE("\n");
 
     v = stack_pop(ctx);
-    hres = to_number(ctx->script, v, ctx->ei, &num);
+    hres = to_number(ctx->script, v, ctx->ei, &n);
     VariantClear(v);
     if(FAILED(hres))
         return hres;
 
-    return stack_push(ctx, &num);
+    return stack_push_number(ctx, n);
 }
 
 /* ECMA-262 3rd Edition    11.3.1 */
@@ -1903,11 +1909,12 @@ static HRESULT interp_postinc(exec_ctx_t *ctx)
 
     hres = disp_propget(ctx->script, obj, id, &v, ctx->ei);
     if(SUCCEEDED(hres)) {
-        VARIANT n, inc;
+        VARIANT inc;
+        double n;
 
         hres = to_number(ctx->script, &v, ctx->ei, &n);
         if(SUCCEEDED(hres)) {
-            num_set_val(&inc, num_val(&n)+(double)arg);
+            num_set_val(&inc, n+(double)arg);
             hres = disp_propput(ctx->script, obj, id, &inc, ctx->ei);
         }
         if(FAILED(hres))
@@ -1937,12 +1944,12 @@ static HRESULT interp_preinc(exec_ctx_t *ctx)
 
     hres = disp_propget(ctx->script, obj, id, &v, ctx->ei);
     if(SUCCEEDED(hres)) {
-        VARIANT n;
+        double n;
 
         hres = to_number(ctx->script, &v, ctx->ei, &n);
         VariantClear(&v);
         if(SUCCEEDED(hres)) {
-            num_set_val(&v, num_val(&n)+(double)arg);
+            num_set_val(&v, n+(double)arg);
             hres = disp_propput(ctx->script, obj, id, &v, ctx->ei);
         }
     }
@@ -1980,23 +1987,31 @@ static HRESULT equal_values(script_ctx_t *ctx, VARIANT *lval, VARIANT *rval, jse
 
     if(V_VT(lval) == VT_BSTR && is_num_vt(V_VT(rval))) {
         VARIANT v;
+        double n;
         HRESULT hres;
 
-        hres = to_number(ctx, lval, ei, &v);
+        hres = to_number(ctx, lval, ei, &n);
         if(FAILED(hres))
             return hres;
 
+        /* FIXME: optimize */
+        num_set_val(&v, n);
+
         return equal_values(ctx, &v, rval, ei, ret);
     }
 
     if(V_VT(rval) == VT_BSTR && is_num_vt(V_VT(lval))) {
         VARIANT v;
+        double n;
         HRESULT hres;
 
-        hres = to_number(ctx, rval, ei, &v);
+        hres = to_number(ctx, rval, ei, &n);
         if(FAILED(hres))
             return hres;
 
+        /* FIXME: optimize */
+        num_set_val(&v, n);
+
         return equal_values(ctx, lval, &v, ei, ret);
     }
 
@@ -2138,7 +2153,8 @@ static HRESULT interp_neq2(exec_ctx_t *ctx)
 /* ECMA-262 3rd Edition    11.8.5 */
 static HRESULT less_eval(script_ctx_t *ctx, VARIANT *lval, VARIANT *rval, BOOL greater, jsexcept_t *ei, BOOL *ret)
 {
-    VARIANT l, r, ln, rn;
+    double ln, rn;
+    VARIANT l, r;
     HRESULT hres;
 
     hres = to_primitive(ctx, lval, ei, &l, NO_HINT);
@@ -2166,15 +2182,7 @@ static HRESULT less_eval(script_ctx_t *ctx, VARIANT *lval, VARIANT *rval, BOOL g
     if(FAILED(hres))
         return hres;
 
-    if(V_VT(&ln) == VT_I4 && V_VT(&rn) == VT_I4) {
-        *ret = (V_I4(&ln) < V_I4(&rn)) ^ greater;
-    }else  {
-        DOUBLE ld = num_val(&ln);
-        DOUBLE rd = num_val(&rn);
-
-        *ret = !isnan(ld) && !isnan(rd) && ((ld < rd) ^ greater);
-    }
-
+    *ret = !isnan(ln) && !isnan(rn) && ((ln < rn) ^ greater);
     return S_OK;
 }
 
diff --git a/dlls/jscript/error.c b/dlls/jscript/error.c
index 6adf60a3acd..d242ce3fc1a 100644
--- a/dlls/jscript/error.c
+++ b/dlls/jscript/error.c
@@ -234,18 +234,16 @@ static HRESULT error_constr(script_ctx_t *ctx, WORD flags, DISPPARAMS *dp,
     HRESULT hres;
 
     if(arg_cnt(dp)) {
-        VARIANT numv;
+        double n;
 
-        hres = to_number(ctx, get_arg(dp, 0), ei, &numv);
-        if(FAILED(hres) || (V_VT(&numv)==VT_R8 && isnan(V_R8(&numv))))
+        hres = to_number(ctx, get_arg(dp, 0), ei, &n);
+        if(FAILED(hres)) /* FIXME: really? */
+            n = ret_nan();
+        if(isnan(n))
             hres = to_string(ctx, get_arg(dp, 0), ei, &msg);
-        else if(V_VT(&numv) == VT_I4)
-            num = V_I4(&numv);
-        else
-            num = V_R8(&numv);
-
         if(FAILED(hres))
             return hres;
+        num = n;
     }
 
     if(arg_cnt(dp)>1 && !msg) {
diff --git a/dlls/jscript/global.c b/dlls/jscript/global.c
index 4ed39402147..d0b7a9bb10b 100644
--- a/dlls/jscript/global.c
+++ b/dlls/jscript/global.c
@@ -386,21 +386,19 @@ static HRESULT JSGlobal_eval(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DIS
 static HRESULT JSGlobal_isNaN(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
         VARIANT *retv, jsexcept_t *ei)
 {
-    VARIANT_BOOL ret = VARIANT_FALSE;
-    VARIANT num;
+    VARIANT_BOOL ret = VARIANT_TRUE;
+    double n;
     HRESULT hres;
 
     TRACE("\n");
 
     if(arg_cnt(dp)) {
-        hres = to_number(ctx, get_arg(dp,0), ei, &num);
+        hres = to_number(ctx, get_arg(dp,0), ei, &n);
         if(FAILED(hres))
             return hres;
 
-        if(V_VT(&num) == VT_R8 && isnan(V_R8(&num)))
-            ret = VARIANT_TRUE;
-    }else {
-        ret = VARIANT_TRUE;
+        if(!isnan(n))
+            ret = VARIANT_FALSE;
     }
 
     if(retv) {
@@ -419,13 +417,13 @@ static HRESULT JSGlobal_isFinite(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags,
     TRACE("\n");
 
     if(arg_cnt(dp)) {
-        VARIANT num;
+        double n;
 
-        hres = to_number(ctx, get_arg(dp,0), ei, &num);
+        hres = to_number(ctx, get_arg(dp,0), ei, &n);
         if(FAILED(hres))
             return hres;
 
-        if(V_VT(&num) != VT_R8 || (!isinf(V_R8(&num)) && !isnan(V_R8(&num))))
+        if(!isinf(n) && !isnan(n))
             ret = VARIANT_TRUE;
     }
 
diff --git a/dlls/jscript/jscript.h b/dlls/jscript/jscript.h
index cd8ec4578c3..fbe3142ec63 100644
--- a/dlls/jscript/jscript.h
+++ b/dlls/jscript/jscript.h
@@ -253,7 +253,7 @@ typedef enum {
 
 HRESULT to_primitive(script_ctx_t*,VARIANT*,jsexcept_t*,VARIANT*, hint_t) DECLSPEC_HIDDEN;
 HRESULT to_boolean(VARIANT*,VARIANT_BOOL*) DECLSPEC_HIDDEN;
-HRESULT to_number(script_ctx_t*,VARIANT*,jsexcept_t*,VARIANT*) DECLSPEC_HIDDEN;
+HRESULT to_number(script_ctx_t*,VARIANT*,jsexcept_t*,double*) DECLSPEC_HIDDEN;
 HRESULT to_integer(script_ctx_t*,VARIANT*,jsexcept_t*,VARIANT*) DECLSPEC_HIDDEN;
 HRESULT to_int32(script_ctx_t*,VARIANT*,jsexcept_t*,INT*) DECLSPEC_HIDDEN;
 HRESULT to_uint32(script_ctx_t*,VARIANT*,jsexcept_t*,DWORD*) DECLSPEC_HIDDEN;
@@ -451,6 +451,13 @@ static inline void num_set_inf(VARIANT *v, BOOL positive)
 #endif
 }
 
+static inline DOUBLE ret_inf(void)
+{
+    VARIANT v;
+    num_set_inf(&v, TRUE);
+    return V_R8(&v);
+}
+
 static inline void var_set_jsdisp(VARIANT *v, jsdisp_t *jsdisp)
 {
     V_VT(v) = VT_DISPATCH;
diff --git a/dlls/jscript/jsutils.c b/dlls/jscript/jsutils.c
index b9a35dbcd2d..564dba69f8d 100644
--- a/dlls/jscript/jsutils.c
+++ b/dlls/jscript/jsutils.c
@@ -312,7 +312,7 @@ static int hex_to_int(WCHAR c)
 }
 
 /* ECMA-262 3rd Edition    9.3.1 */
-static HRESULT str_to_number(BSTR str, VARIANT *ret)
+static HRESULT str_to_number(BSTR str, double *ret)
 {
     const WCHAR *ptr = str;
     BOOL neg = FALSE;
@@ -336,9 +336,9 @@ static HRESULT str_to_number(BSTR str, VARIANT *ret)
             ptr++;
 
         if(*ptr)
-            num_set_nan(ret);
+            *ret = ret_nan();
         else
-            num_set_inf(ret, !neg);
+            *ret = neg ? -ret_inf() : ret_inf();
         return S_OK;
     }
 
@@ -351,7 +351,7 @@ static HRESULT str_to_number(BSTR str, VARIANT *ret)
             ptr++;
         }
 
-        num_set_val(ret, d);
+        *ret = d;
         return S_OK;
     }
 
@@ -390,31 +390,32 @@ static HRESULT str_to_number(BSTR str, VARIANT *ret)
         ptr++;
 
     if(*ptr) {
-        num_set_nan(ret);
+        *ret = ret_nan();
         return S_OK;
     }
 
     if(neg)
         d = -d;
 
-    num_set_val(ret, d);
+    *ret = d;
     return S_OK;
 }
 
 /* ECMA-262 3rd Edition    9.3 */
-HRESULT to_number(script_ctx_t *ctx, VARIANT *v, jsexcept_t *ei, VARIANT *ret)
+HRESULT to_number(script_ctx_t *ctx, VARIANT *v, jsexcept_t *ei, double *ret)
 {
     switch(V_VT(v)) {
     case VT_EMPTY:
-        num_set_nan(ret);
+        *ret = ret_nan();
         break;
     case VT_NULL:
-        V_VT(ret) = VT_I4;
-        V_I4(ret) = 0;
+        *ret = 0;
         break;
     case VT_I4:
+        *ret = V_I4(v);
+        break;
     case VT_R8:
-        *ret = *v;
+        *ret = V_R8(v);
         break;
     case VT_BSTR:
         return str_to_number(V_BSTR(v), ret);
@@ -431,8 +432,7 @@ HRESULT to_number(script_ctx_t *ctx, VARIANT *v, jsexcept_t *ei, VARIANT *ret)
         return hres;
     }
     case VT_BOOL:
-        V_VT(ret) = VT_I4;
-        V_I4(ret) = V_BOOL(v) ? 1 : 0;
+        *ret = V_BOOL(v) ? 1 : 0;
         break;
     default:
         FIXME("unimplemented for vt %d\n", V_VT(v));
@@ -445,20 +445,23 @@ HRESULT to_number(script_ctx_t *ctx, VARIANT *v, jsexcept_t *ei, VARIANT *ret)
 /* ECMA-262 3rd Edition    9.4 */
 HRESULT to_integer(script_ctx_t *ctx, VARIANT *v, jsexcept_t *ei, VARIANT *ret)
 {
-    VARIANT num;
+    double n;
     HRESULT hres;
 
-    hres = to_number(ctx, v, ei, &num);
+    if(V_VT(v) == VT_I4) {
+        *ret = *v;
+        return S_OK;
+    }
+
+    hres = to_number(ctx, v, ei, &n);
     if(FAILED(hres))
         return hres;
 
-    if(V_VT(&num) == VT_I4) {
-        *ret = num;
-    }else if(isnan(V_R8(&num))) {
+    if(isnan(n)) {
         V_VT(ret) = VT_I4;
         V_I4(ret) = 0;
     }else {
-        num_set_val(ret, V_R8(&num) >= 0.0 ? floor(V_R8(&num)) : -floor(-V_R8(&num)));
+        num_set_val(ret, n >= 0.0 ? floor(n) : -floor(-n));
     }
 
     return S_OK;
@@ -467,34 +470,38 @@ HRESULT to_integer(script_ctx_t *ctx, VARIANT *v, jsexcept_t *ei, VARIANT *ret)
 /* ECMA-262 3rd Edition    9.5 */
 HRESULT to_int32(script_ctx_t *ctx, VARIANT *v, jsexcept_t *ei, INT *ret)
 {
-    VARIANT num;
+    double n;
     HRESULT hres;
 
-    hres = to_number(ctx, v, ei, &num);
+    if(V_VT(v) == VT_I4) {
+        *ret = V_I4(v);
+        return S_OK;
+    }
+
+    hres = to_number(ctx, v, ei, &n);
     if(FAILED(hres))
         return hres;
 
-    if(V_VT(&num) == VT_I4)
-        *ret = V_I4(&num);
-    else
-        *ret = isnan(V_R8(&num)) || isinf(V_R8(&num)) ? 0 : (INT)V_R8(&num);
+    *ret = isnan(n) || isinf(n) ? 0 : n;
     return S_OK;
 }
 
 /* ECMA-262 3rd Edition    9.6 */
 HRESULT to_uint32(script_ctx_t *ctx, VARIANT *v, jsexcept_t *ei, DWORD *ret)
 {
-    VARIANT num;
+    double n;
     HRESULT hres;
 
-    hres = to_number(ctx, v, ei, &num);
+    if(V_VT(v) == VT_I4) {
+        *ret = V_I4(v);
+        return S_OK;
+    }
+
+    hres = to_number(ctx, v, ei, &n);
     if(FAILED(hres))
         return hres;
 
-    if(V_VT(&num) == VT_I4)
-        *ret = V_I4(&num);
-    else
-        *ret = isnan(V_R8(&num)) || isinf(V_R8(&num)) ? 0 : (DWORD)V_R8(&num);
+    *ret = isnan(n) || isinf(n) ? 0 : n;
     return S_OK;
 }
 
@@ -679,17 +686,19 @@ HRESULT variant_change_type(script_ctx_t *ctx, VARIANT *dst, VARIANT *src, VARTY
         }
         break;
     }
-    case VT_R8:
-        hres = to_number(ctx, src, &ei, dst);
-        if(SUCCEEDED(hres) && V_VT(dst) == VT_I4)
-            V_R8(dst) = V_I4(dst);
+    case VT_R8: {
+        double n;
+        hres = to_number(ctx, src, &ei, &n);
+        if(SUCCEEDED(hres))
+            V_R8(dst) = n;
         break;
+    }
     case VT_R4: {
-        VARIANT n;
+        double n;
 
         hres = to_number(ctx, src, &ei, &n);
         if(SUCCEEDED(hres))
-            V_R4(dst) = num_val(&n);
+            V_R4(dst) = n;
         break;
     }
     case VT_BOOL: {
diff --git a/dlls/jscript/math.c b/dlls/jscript/math.c
index b28431eec0d..9c17967edd8 100644
--- a/dlls/jscript/math.c
+++ b/dlls/jscript/math.c
@@ -61,8 +61,7 @@ static const WCHAR tanW[] = {'t','a','n',0};
 static HRESULT Math_abs(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
         VARIANT *retv, jsexcept_t *ei)
 {
-    VARIANT v;
-    DOUBLE d;
+    double d;
     HRESULT hres;
 
     TRACE("\n");
@@ -73,11 +72,10 @@ static HRESULT Math_abs(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARA
         return S_OK;
     }
 
-    hres = to_number(ctx, get_arg(dp, 0), ei, &v);
+    hres = to_number(ctx, get_arg(dp, 0), ei, &d);
     if(FAILED(hres))
         return hres;
 
-    d = num_val(&v);
     if(retv)
         num_set_val(retv, d < 0.0 ? -d : d);
     return S_OK;
@@ -86,7 +84,7 @@ static HRESULT Math_abs(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARA
 static HRESULT Math_acos(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
         VARIANT *retv, jsexcept_t *ei)
 {
-    VARIANT v;
+    double x;
     HRESULT hres;
 
     TRACE("\n");
@@ -96,12 +94,11 @@ static HRESULT Math_acos(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPAR
         return S_OK;
     }
 
-    hres = to_number(ctx, get_arg(dp, 0), ei, &v);
+    hres = to_number(ctx, get_arg(dp, 0), ei, &x);
     if(FAILED(hres))
         return hres;
 
     if(retv) {
-        DOUBLE x = num_val(&v);
         if(x < -1.0 || x > 1.0)
             num_set_nan(retv);
         else
@@ -113,7 +110,7 @@ static HRESULT Math_acos(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPAR
 static HRESULT Math_asin(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
         VARIANT *retv, jsexcept_t *ei)
 {
-    VARIANT v;
+    double x;
     HRESULT hres;
 
     TRACE("\n");
@@ -123,12 +120,11 @@ static HRESULT Math_asin(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPAR
         return S_OK;
     }
 
-    hres = to_number(ctx, get_arg(dp, 0), ei, &v);
+    hres = to_number(ctx, get_arg(dp, 0), ei, &x);
     if(FAILED(hres))
         return hres;
 
     if(retv) {
-        DOUBLE x = num_val(&v);
         if(x < -1.0 || x > 1.0)
             num_set_nan(retv);
         else
@@ -140,7 +136,7 @@ static HRESULT Math_asin(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPAR
 static HRESULT Math_atan(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
         VARIANT *retv, jsexcept_t *ei)
 {
-    VARIANT v;
+    double x;
     HRESULT hres;
 
     TRACE("\n");
@@ -150,18 +146,18 @@ static HRESULT Math_atan(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPAR
         return S_OK;
     }
 
-    hres = to_number(ctx, get_arg(dp, 0), ei, &v);
+    hres = to_number(ctx, get_arg(dp, 0), ei, &x);
     if(FAILED(hres))
         return hres;
 
-    if(retv) num_set_val(retv, atan(num_val(&v)));
+    if(retv) num_set_val(retv, atan(x));
     return S_OK;
 }
 
 static HRESULT Math_atan2(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
         VARIANT *retv, jsexcept_t *ei)
 {
-    VARIANT v1, v2;
+    double x, y;
     HRESULT hres;
 
     TRACE("\n");
@@ -171,15 +167,15 @@ static HRESULT Math_atan2(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPA
         return S_OK;
     }
 
-    hres = to_number(ctx, get_arg(dp, 0), ei, &v1);
+    hres = to_number(ctx, get_arg(dp, 0), ei, &y);
     if(FAILED(hres))
         return hres;
 
-    hres = to_number(ctx, get_arg(dp, 1), ei, &v2);
+    hres = to_number(ctx, get_arg(dp, 1), ei, &x);
     if(FAILED(hres))
         return hres;
 
-    if(retv) num_set_val(retv, atan2(num_val(&v1), num_val(&v2)));
+    if(retv) num_set_val(retv, atan2(y, x));
     return S_OK;
 }
 
@@ -187,7 +183,7 @@ static HRESULT Math_atan2(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPA
 static HRESULT Math_ceil(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
         VARIANT *retv, jsexcept_t *ei)
 {
-    VARIANT v;
+    double x;
     HRESULT hres;
 
     TRACE("\n");
@@ -198,19 +194,19 @@ static HRESULT Math_ceil(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPAR
         return S_OK;
     }
 
-    hres = to_number(ctx, get_arg(dp, 0), ei, &v);
+    hres = to_number(ctx, get_arg(dp, 0), ei, &x);
     if(FAILED(hres))
         return hres;
 
     if(retv)
-        num_set_val(retv, ceil(num_val(&v)));
+        num_set_val(retv, ceil(x));
     return S_OK;
 }
 
 static HRESULT Math_cos(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
         VARIANT *retv, jsexcept_t *ei)
 {
-    VARIANT v;
+    double x;
     HRESULT hres;
 
     TRACE("\n");
@@ -220,18 +216,18 @@ static HRESULT Math_cos(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARA
         return S_OK;
     }
 
-    hres = to_number(ctx, get_arg(dp, 0), ei, &v);
+    hres = to_number(ctx, get_arg(dp, 0), ei, &x);
     if(FAILED(hres))
         return hres;
 
-    if(retv) num_set_val(retv, cos(num_val(&v)));
+    if(retv) num_set_val(retv, cos(x));
     return S_OK;
 }
 
 static HRESULT Math_exp(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
         VARIANT *retv, jsexcept_t *ei)
 {
-    VARIANT v;
+    double x;
     HRESULT hres;
 
     TRACE("\n");
@@ -241,18 +237,18 @@ static HRESULT Math_exp(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARA
         return S_OK;
     }
 
-    hres = to_number(ctx, get_arg(dp, 0), ei, &v);
+    hres = to_number(ctx, get_arg(dp, 0), ei, &x);
     if(FAILED(hres))
         return hres;
 
-    if(retv) num_set_val(retv, exp(num_val(&v)));
+    if(retv) num_set_val(retv, exp(x));
     return S_OK;
 }
 
 static HRESULT Math_floor(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
         VARIANT *retv, jsexcept_t *ei)
 {
-    VARIANT v;
+    double x;
     HRESULT hres;
 
     TRACE("\n");
@@ -263,19 +259,19 @@ static HRESULT Math_floor(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPA
         return S_OK;
     }
 
-    hres = to_number(ctx, get_arg(dp, 0), ei, &v);
+    hres = to_number(ctx, get_arg(dp, 0), ei, &x);
     if(FAILED(hres))
         return hres;
 
     if(retv)
-        num_set_val(retv, floor(num_val(&v)));
+        num_set_val(retv, floor(x));
     return S_OK;
 }
 
 static HRESULT Math_log(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
         VARIANT *retv, jsexcept_t *ei)
 {
-    VARIANT v;
+    double x;
     HRESULT hres;
 
     TRACE("\n");
@@ -286,12 +282,11 @@ static HRESULT Math_log(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARA
         return S_OK;
     }
 
-    hres = to_number(ctx, get_arg(dp, 0), ei, &v);
+    hres = to_number(ctx, get_arg(dp, 0), ei, &x);
     if(FAILED(hres))
         return hres;
 
     if(retv) {
-        DOUBLE x = num_val(&v);
         if(x < -0.0)
             num_set_nan(retv);
         else
@@ -305,7 +300,6 @@ static HRESULT Math_max(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARA
         VARIANT *retv, jsexcept_t *ei)
 {
     DOUBLE max, d;
-    VARIANT v;
     DWORD i;
     HRESULT hres;
 
@@ -317,17 +311,15 @@ static HRESULT Math_max(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARA
         return S_OK;
     }
 
-    hres = to_number(ctx, get_arg(dp, 0), ei, &v);
+    hres = to_number(ctx, get_arg(dp, 0), ei, &max);
     if(FAILED(hres))
         return hres;
 
-    max = num_val(&v);
     for(i=1; i < arg_cnt(dp); i++) {
-        hres = to_number(ctx, get_arg(dp, i), ei, &v);
+        hres = to_number(ctx, get_arg(dp, i), ei, &d);
         if(FAILED(hres))
             return hres;
 
-        d = num_val(&v);
         if(d > max || isnan(d))
             max = d;
     }
@@ -342,7 +334,6 @@ static HRESULT Math_min(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARA
         VARIANT *retv, jsexcept_t *ei)
 {
     DOUBLE min, d;
-    VARIANT v;
     DWORD i;
     HRESULT hres;
 
@@ -354,17 +345,15 @@ static HRESULT Math_min(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARA
         return S_OK;
     }
 
-    hres = to_number(ctx, get_arg(dp, 0), ei, &v);
+    hres = to_number(ctx, get_arg(dp, 0), ei, &min);
     if(FAILED(hres))
         return hres;
 
-    min = num_val(&v);
     for(i=1; i < arg_cnt(dp); i++) {
-        hres = to_number(ctx, get_arg(dp, i), ei, &v);
+        hres = to_number(ctx, get_arg(dp, i), ei, &d);
         if(FAILED(hres))
             return hres;
 
-        d = num_val(&v);
         if(d < min || isnan(d))
             min = d;
     }
@@ -378,7 +367,7 @@ static HRESULT Math_min(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARA
 static HRESULT Math_pow(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
         VARIANT *retv, jsexcept_t *ei)
 {
-    VARIANT x, y;
+    double x, y;
     HRESULT hres;
 
     TRACE("\n");
@@ -397,7 +386,7 @@ static HRESULT Math_pow(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARA
         return hres;
 
     if(retv)
-        num_set_val(retv, pow(num_val(&x), num_val(&y)));
+        num_set_val(retv, pow(x, y));
     return S_OK;
 }
 
@@ -422,7 +411,7 @@ static HRESULT Math_random(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPP
 static HRESULT Math_round(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
         VARIANT *retv, jsexcept_t *ei)
 {
-    VARIANT v;
+    double x;
     HRESULT hres;
 
     TRACE("\n");
@@ -432,19 +421,19 @@ static HRESULT Math_round(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPA
         return S_OK;
     }
 
-    hres = to_number(ctx, get_arg(dp, 0), ei, &v);
+    hres = to_number(ctx, get_arg(dp, 0), ei, &x);
     if(FAILED(hres))
         return hres;
 
     if(retv)
-        num_set_val(retv, floor(num_val(&v)+0.5));
+        num_set_val(retv, floor(x+0.5));
     return S_OK;
 }
 
 static HRESULT Math_sin(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
         VARIANT *retv, jsexcept_t *ei)
 {
-    VARIANT v;
+    double x;
     HRESULT hres;
 
     TRACE("\n");
@@ -454,18 +443,18 @@ static HRESULT Math_sin(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARA
         return S_OK;
     }
 
-    hres = to_number(ctx, get_arg(dp, 0), ei, &v);
+    hres = to_number(ctx, get_arg(dp, 0), ei, &x);
     if(FAILED(hres))
         return hres;
 
-    if(retv) num_set_val(retv, sin(num_val(&v)));
+    if(retv) num_set_val(retv, sin(x));
     return S_OK;
 }
 
 static HRESULT Math_sqrt(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
         VARIANT *retv, jsexcept_t *ei)
 {
-    VARIANT v;
+    double x;
     HRESULT hres;
 
     TRACE("\n");
@@ -475,18 +464,18 @@ static HRESULT Math_sqrt(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPAR
         return S_OK;
     }
 
-    hres = to_number(ctx, get_arg(dp, 0), ei, &v);
+    hres = to_number(ctx, get_arg(dp, 0), ei, &x);
     if(FAILED(hres))
         return hres;
 
-    if(retv) num_set_val(retv, sqrt(num_val(&v)));
+    if(retv) num_set_val(retv, sqrt(x));
     return S_OK;
 }
 
 static HRESULT Math_tan(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
         VARIANT *retv, jsexcept_t *ei)
 {
-    VARIANT v;
+    double x;
     HRESULT hres;
 
     TRACE("\n");
@@ -496,11 +485,11 @@ static HRESULT Math_tan(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARA
         return S_OK;
     }
 
-    hres = to_number(ctx, get_arg(dp, 0), ei, &v);
+    hres = to_number(ctx, get_arg(dp, 0), ei, &x);
     if(FAILED(hres))
         return hres;
 
-    if(retv) num_set_val(retv, tan(num_val(&v)));
+    if(retv) num_set_val(retv, tan(x));
     return S_OK;
 }
 
diff --git a/dlls/jscript/number.c b/dlls/jscript/number.c
index e364f119a0f..7a3d8b0d4b6 100644
--- a/dlls/jscript/number.c
+++ b/dlls/jscript/number.c
@@ -263,7 +263,7 @@ static const builtin_info_t Number_info = {
 static HRESULT NumberConstr_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,
         VARIANT *retv, jsexcept_t *ei)
 {
-    VARIANT num;
+    double n;
     HRESULT hres;
 
     TRACE("\n");
@@ -278,27 +278,30 @@ static HRESULT NumberConstr_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags
             return S_OK;
         }
 
-        hres = to_number(ctx, get_arg(dp, 0), ei, &num);
+        hres = to_number(ctx, get_arg(dp, 0), ei, &n);
         if(FAILED(hres))
             return hres;
 
         if(retv)
-            *retv = num;
+            num_set_val(retv, n);
         break;
 
     case DISPATCH_CONSTRUCT: {
         jsdisp_t *obj;
+        VARIANT v;
 
         if(arg_cnt(dp)) {
-            hres = to_number(ctx, get_arg(dp, 0), ei, &num);
+            hres = to_number(ctx, get_arg(dp, 0), ei, &n);
             if(FAILED(hres))
                 return hres;
+
+            num_set_val(&v, n);
         }else {
-            V_VT(&num) = VT_I4;
-            V_I4(&num) = 0;
+            V_VT(&v) = VT_I4;
+            V_I4(&v) = 0;
         }
 
-        hres = create_number(ctx, &num, &obj);
+        hres = create_number(ctx, &v, &obj);
         if(FAILED(hres))
             return hres;
 
diff --git a/dlls/jscript/regexp.c b/dlls/jscript/regexp.c
index 5106604f9a1..8e80f9be522 100644
--- a/dlls/jscript/regexp.c
+++ b/dlls/jscript/regexp.c
@@ -3522,22 +3522,18 @@ static HRESULT RegExp_multiline(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags,
 static INT index_from_var(script_ctx_t *ctx, VARIANT *v)
 {
     jsexcept_t ei;
-    VARIANT num;
+    double n;
     HRESULT hres;
 
     memset(&ei, 0, sizeof(ei));
-    hres = to_number(ctx, v, &ei, &num);
+    hres = to_number(ctx, v, &ei, &n);
     if(FAILED(hres)) { /* FIXME: Move ignoring exceptions to to_primitive */
         VariantClear(&ei.var);
         return 0;
     }
 
-    if(V_VT(&num) == VT_R8) {
-        DOUBLE d = floor(V_R8(&num));
-        return (DOUBLE)(INT)d == d ? d : 0;
-    }
-
-    return V_I4(&num);
+    n = floor(n);
+    return (double)(INT)n == n ? n : 0;
 }
 
 static HRESULT RegExp_lastIndex(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags, DISPPARAMS *dp,