Function group

resources/vega.min.js:7476–7484

(t)

        );
      },
      group(t) {
        let e = this.value[t];
        return (
          e || ((e = this.value[t] = su(ma)), (e.stamp = -1)),
          e.stamp < this.stamp &&
            ((e.stamp = this.stamp), (this._mods[this._mlen++] = e)),
          e
        );
      },
    }));
  var ml = Object.freeze({
    __proto__: null,