message: Call Map.has
diff: @@ -234,7 +234,7 @@ export class Reference implements IProvider {
  if (result === null) {
  break
  }
  - if (result[1].endsWith('@cref') && result[1].replace('@cref', '') in this.prevIndexObj) {
  + if ( result[1].endsWith('@cref') && this.prevIndexObj.has(result[1].replace('@cref', '')) ) {
  // Drop extra \newlabel entries added by cleveref
  continue
  }
  