nl_tokens: deeply freeze an object to make it fully immutable
pl_tokens: function ( obj ) { if ( obj == null || typeof obj != 'object' || <mask> . isFrozen ( obj ) || obj . _keepHot ) return ; Object . freeze ( obj ) ; // First freeze the object. for ( var key in obj ) { if ( obj . hasOwnProperty ( key ) ) deepFreeze ( obj [ key ] ) ; // Recursively call deepFreeze. } }