cv_name_hek

Return the CV’s name when it was stored as a HEK rather than via a GV.

Synopsis

my $name = $cv->NAME_HEK;    # undef unless CVf_NAMED is set

Modern perl stores some sub names directly in a hash-key slot on the CV (cheaper than a full GV). If the CV does not use that slot, returns undef; callers generally fall back to $cv->GV->NAME.