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PERL_EXT_RE_BUILD was listed twice. Remove the one where it was unconditionally set false; retaining the more flexible, hence accurate, one.
I did some more grepping of the source to look for symbols that we can assume are undefined for general usage, cpan and darkpan. An example is PERL_EXT_POSIX (seeing that in the source prompted this endeavor). That symbol should only be defined when compiling the POSIX module, so any symbols created only while it is #defined, won't be visible to the outside world. I looked for "/ \b PERL_ \w+ /x" and scanned through the list. The result are the symbols added here, which showed that 5 symbols this previously thought were visible everywhere actually aren't. So they are removed from the list.
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I did some more grepping of the source to look for symbols that we can assume are undefined for general usage, cpan and darkpan. An example is PERL_EXT_POSIX (seeing that in the source prompted this endeavour). That symbol should only be defined when compiling the POSIX module, so any symbols created only while it is #defined, won't be visible to the outside world.
I looked for "/ \b PERL_ \w+ /x" and scanned through the list. The result are the symbols added here, which showed that 5 symbols this previously thought were visible everywhere actually aren't. So they are removed from the list.