Follow-up Comment #19, bug #67571 (group groff): It's worth noting that I now think the quoted code in comment #18 is not correct.
`using_character_classes` is not, I now think, intended as an optimization of
any kind, but rather to put the parser into a special state such that special
character identifiers are looked up first in `char_class_dictionary`.
See bug #67711.
I furthermore acknowledge that my comments on several character class-related
are coming thick and fast and I'm venturing and withdrawing hypotheses at a
rapid rate.
I won't apologize for that, but offer it as an object lesson: this is why we
(should) write comprehensive documentation and unit tests for features when
implementing them.
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