Fix #12370. Explicitly coerce bool/undef to integer.

diff --git a/src/effects.js b/src/effects.js
index cc2a26a1e6aa1287dd55f0b6064dace782212817..8752838fbf1ba4b61ab54ee06ea0c44b7e87fcf0 100644 (file)
--- a/src/effects.js
+++ b/src/effects.js
@@ -540,6 +540,7 @@ function genFx( type, includeWidth ) {
 
        // if we include width, step value is 1 to do all cssExpand values,
        // if we don't include width, step value is 2 to skip over Left and Right
+       includeWidth = includeWidth? 1 : 0;
        for( ; i < 4 ; i += 2 - includeWidth ) {
                which = cssExpand[ i ];
                attrs[ "margin" + which ] = attrs[ "padding" + which ] = type;