Obsolete since JSAPI 32
This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.
Determine if a given
jsval is of a primitive type.
JSVAL_IS_PRIMITIVE(v) is true if
null, a boolean, a number, or a string. Otherwise it is false, and
v is an object.