src/broadcast.js
function (x) {
            var i = indexOf.call(k, x);
            k.splice(i, 1);
            v.splice(i, 1);
          }
function (x) {
            var i = indexOf.call(k, x);
            k.splice(i, 1);
            v.splice(i, 1);
          }
function ( x ) { var i = indexOf . call ( k , x ) ; k . splice ( i , 1 ) ; v . splice ( i , 1 ) ; }
delete used to be a reserved property name
delete used to be a reserved property name