I ask because we're trying to determine whether there would be any problems with a proposed solution (using "De-duplication") for the rare bug where MassMessage can post the same message to the same page multiple times due to JobQueue issues (see tech details in phab:T232379#5480718).

I.e. It would make it impossible to send exactly the same message to the same page regardless of timing.

Would that cause a problem on any wiki that you know of?

We think not, but want to be more certain. Thanks.