message: Update Dictionary.ts delete method  to also remove key
diff: @@ -67,6 +67,7 @@ export class Dictionary<K, V> {
  const bound = this.lowerBound(key);
  if (bound.equal) {
  this._values.splice(bound.index, 1);
  + this._keys.splice(bound.index, 1);
  }
  }
  