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ESC[ { parameter: 0+ characters 0x30 through 0x3f } { intermediate: 0+ characters 0x20 through 0x2f } { final byte: character 0x40 through 0x7e }
with special requirements on the format of the parameter that MegaZeux partially implements. Any ANSi files that include a <=>? prefix on the parameter or any intermediates will be parsed incorrectly in MegaZeux, currently. (Final bytes are fine but technically too permissive currently.)
SyncTERM manual
ECMA-48_5th_edition_june_1991.pdf
This is too fiddly for 2.93d and will pretty much require regression tests for the whole ANSi subsystem, so delaying until 2.93e.