This is a live mirror of the Perl 5 development currently hosted at https://github.com/perl/perl5
use cBOOL for bool casts
bool b = (bool)some_int
doesn't necessarily do what you think. In some builds, bool is defined as
char, and that cast's behaviour is thus undefined. So this line in mg.c:
const bool was_temp = (bool)SvTEMP(sv);
was actually setting was_temp to false even when the SVs_TEMP flag was set.
Fix this by replacing all the (bool) casts with a new cBOOL() cast macro
that (hopefully) does the right thing.