Maybe something like "was-yes/was-no" for confirmed transactions is better?
It's not very useful though. A confirmed transaction is confirmed, so it makes zero difference at that point whether it
was replaceable... as once it is confirmed, it can't be replaced.
I can't really think of a useful purpose for a "was-yes/was-no" indicator outside of possibly testing that the flag
was being set correctly... but it should be easy enough to simply generate a transaction and not broadcast it to see if the flag is being set as intended.