allowMultipleValues () {
    for (const flag of arguments) {
      this.#flagRef(flag).allowMultipleValues()
    }
  }
// In case of duplicate flag, ignore all but last flag value
In case of duplicate flag, ignore all but last flag value
In case of duplicate flag ignore all but last flag value
allowMultipleValues () {
    for (const flag of arguments) {
      this.#flagRef(flag).allowMultipleValues()
    }
  }
allowMultipleValues ( ) { for ( const flag of arguments ) { this . #flagRef ( flag ) . allowMultipleValues ( ) } }
In case of duplicate flag, ignore all but last flag value
In case of duplicate flag ignore all but last flag value