hunk.code_window:     return i === -1 ? undefined : this._values[i];
     }
     set(key, value) {
       let i = this._keys.indexOf(key);
       if (i === -1) {
         this._keys.push(key);
         this._values.push(value);
         this.size++;
  
hunk.labels: keep keep keep replace replace keep keep keep keep
hunk.after_edit:   set(key, value): any {
       const i = this._keys.indexOf(key);
  
hunk.file_path: src/util/MapPolyfill.ts
hunk.type: replace
file: import {Observable} from '../../Observable';
  import {IntervalObservable} from '../../observable/interval';
  Observable.interval = IntervalObservable.create;
  
  export var _void: void;