nl_tokens: Caching has check .
pl_tokens: function check ( type , hash , callback ) { if ( typeof type !== "string" ) throw <mask> TypeError ( "type must be string" ) ; if ( typeof hash !== "string" ) throw new TypeError ( "hash must be string" ) ; if ( hasCache [ hash ] ) return callback ( null , true ) ; local . hasHash ( hash , function ( err , has ) { if ( err ) return callback ( err ) ; hasCache [ hash ] = has ; callback ( null , has ) ; } ) ; }