nl_tokens: Checks if value is a plain object that is an object created by the Object constructor or one with a [[ Prototype ]] of null .
pl_tokens: function isPlainObject ( value ) { var Ctor ; // Exit early for non `Object` objects. if ( ! ( isObjectLike ( value ) && objToString . call ( value ) == objectTag && ! isArguments ( value ) ) || ( ! hasOwnProperty . call ( value , 'constructor' ) && ( Ctor = value . constructor , typeof Ctor == 'function' && ! ( Ctor instanceof Ctor ) ) ) ) { return false ; } // IE < 9 iterates inherited properties before own properties. If the first // iterated property is an object's own property then there are no inherited // enumerable properties. var result ; // In most environments an object's own properties are iterated before // its inherited properties. If the last iterated property is an object's // own property then there are no inherited enumerable properties. baseForIn ( value , function ( subValue , key ) { result = key ; } ) ; return result === undefined || hasOwnProperty . call ( value , <mask> ) ; }