> CORE functions:
nope these are some plain named symbols in the %main:: STASH since your var $CORE is undef.
Anyway you need to check the {CODE} slot of the glob-values to be sure that they hold a code-ref.
DB<30> sub test { "bla" }
DB<31> x map { \&$_ } grep {defined &$_ } values %::
0 CODE(0x3477178)
-> &main::test in (eval 40)[C:/Perl_524/lib/perl5db.pl:737]:2-2
1 CODE(0x3463838)
-> &main::dumpvar in C:/Perl_524/lib/dumpvar.pl:474-501
2 CODE(0x3457a78)
-> &main::dumpValue in C:/Perl_524/lib/dumpvar.pl:33-40
DB<32>
dumpvar and dumpValue are internal debugger routines
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