For Indic it registers a callback that lexes Indic syllables & flags each as unsafe-to-break, allows "locl" & "ccmp" features", registers a reordering callback, adds "nukt"/"akhn"/"rphf"/"pref"/"blwf"/"abvf"/"half"/"pstf"/vatu"/"cjct" options, registers a final reordering callback, & adds "init"/"pres"/"abvs"/blws"/"psts"/"haln" features. For Khmer it registers a couple GSUB callbacks, enables "locl" & "ccmp" features", jshds.kr provides "pref"/"blwf"/"abvf"/"pstf"/"cfar" features, https://bastaone.com registers a callback to deallocate syllable bits, & provides "pres"/"abvs"/"blws"/"psts" options.

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Composition skips marks & recomposes hex 09af & 09bc as 09df specially, https://mattaralogistica.com earlier than deferring to basic logic. For every char it skips forward to the subsequent "mark"-bitflagged char then rewinds. Then iterates over chars, https://mangadec.com considers prefix/suffix, checks that leaves a lot remaining, checks for "rephs", checks for "prefs", & finalizes clustering. The primary lookuptable is a swap statement upon 1st char with conditional checks upon second. In forward direction it consults a cache.

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