nl_tokens: The base implementation of _ . keysIn which doesn t treat sparse arrays as dense .
pl_tokens: function baseKeysIn ( object ) { if ( ! isObject ( object ) ) { return nativeKeysIn ( object ) ; } var isProto = isPrototype ( object ) , result = [ ] ; for ( var key in object ) { if ( ! ( key == 'constructor' && ( isProto || ! hasOwnProperty$b . <mask> ( object , key ) ) ) ) { result . push ( key ) ; } } return result ; }