The _.uniqueId() function in Underscore is intended for "temporary DOM ids," which seems similar to what you're going for? http://underscorejs.org/docs/underscore.html#section-164

While that doesn't really reduce the "overhead" of the change (and might even increase the overhead because we need to make sure Underscore loads before fieldmanager.js, although #625 might have the same effect), it might allow us to offload some of the work to an existing library, and it might at least "feel" cleaner.

Confirming that this branch does fix the issue for us! 🥇

It works for us too! Thank you.

This fix worked for me! Can we get this merged?

While it might be more overhead than ideal in theory (or might not), in practice there are many testimonials to it working, and no new approaches have been presented, so I think we can move ahead. We can always improve its performance in future PRs.