We do not currently run automated tests, but given that this loads a much smaller subset of the ACE Editor files, I tested this manually for html, scss, sql editors, and operations like editing text, searching, moving text using shortcuts, etc. and it works well.
The file size savings are considerable:
Previously: 245 files, 14.3 Mb Now: 7 files, 0.68 Mb
The upgrade to 1.4.12 also allows us to set placeholders for the ACE Editor inputs, I am planning to use this soon.