(for context, we're talking about https://cfengine.com/dev/issues/3731 which is provided together with a performance optimization)

It was requested by a CFEngine developer and seconded by a customer.  It's very minor and consistent with the already available `this.promiser_uid` and `this.promiser_gid`, so I thought it wasn't significant enough to discuss at the product council level .  @nickanderson @zzamboni @estenberg can any of you provide feedback?