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[NEW] for additions of new features
[ENH] is an enhancement; not really new but makes things work better (e.g. look and feel, performance...)
[MOD] is a change in how things work, which may disrupt user habits, for example, changing the default value of an option
[FIX] for bug fixes of any sort
[SEC] for security fix operations (implies [FIX])
[UPD] for updates of third party/vendor libraries
[UX] for user experience improvements; makes Tiki easier to use and understand (more details in https://dev.tiki.org/UX )
[DB] for changes in the database
[REM] for feature removals
[KIL] for removals of unused or obsolete files (has been used in the sense of [REM] prior to Tiki 6)
[REF] for refactoring; changes the structure of the code (to make it cleaner or clearer), without changing its actual behavior.
[REL] for the release process
[MRG] for branch merges, generally performed by the merge scripts
[DOC] for improvements in the tips or contextual documentation provided to the user/admin
[TRA] for translation
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