nl_tokens: Checks if value is classified as a Function object .
pl_tokens: function isFunction$2 ( <mask> ) { // The use of `Object#toString` avoids issues with the `typeof` operator // in Safari 8-9 which returns 'object' for typed array and other constructors. var tag = isObject$2 ( value ) ? objectToString$3 . call ( value ) : '' ; return tag == funcTag$2 || tag == genTag$2 ; }