During prefilter region replacement, turn regions with very large max
bounds into repeats with inf max bound. This improves compile time and
the likelihood that we will actually be able to build an implementation
for such patterns.
ComponentClass::class_empty should only be used on finalized classes to
determine whether a given class contains any elements; it should not
take the cr_ucp or cps_ucp into account, as they have been folden in by
the finalize call.
Fixes our failure to identify that the pattern /[^\D\d]/8W can never
match.
Implement rejection of POSIX collating elements ("[.ch.]" and "[=ch=]"
entirely in the Ragel parser, using the same approach both inside and
ouside character classes.
Fix buggy rejection of [^.ch.], which we should accept as a character
class.
