build/es-class.max.amd.js
function (method) {
        var
          str = '' + method,
          i = str.indexOf(SUPER)
        ;
        return i < 0 ?
          false :
          isBoundary(str.charCodeAt(i - 1)) &&
          isBoundary(str.charCodeAt(i + 5));
      }
function (method) {
        var
          str = '' + method,
          i = str.indexOf(SUPER)
        ;
        return i < 0 ?
          false :
          isBoundary(str.charCodeAt(i - 1)) &&
          isBoundary(str.charCodeAt(i + 5));
      }
function ( method ) { var str = '' + method , i = str . indexOf ( SUPER ) ; return i < 0 ? false : isBoundary ( str . charCodeAt ( i - 1 ) ) && isBoundary ( str . charCodeAt ( i + 5 ) ) ; }
all other JS engines should be just fine
all other JS engines should be just fine