is_bool() should recognize unblessed_bool booleans

[Karen Etheridge]

is_bool() should check for the values &PL_sv_yes and &PL_sv_no, which is what is produced when decoding booleans when unblessed_bools is set.

In pure perl this can be done with sub isbool { return 1 if <other checks> || \$_[0] == \!!0 || \$_[0] == \!!1 } -- I expect the XS equivalent is just comparing to &PL_sv_yes directly.

[Karen Etheridge]

oh perhaps not, given #121

[Reini Urban]

Exactly. We need non-readonly copies

[Reini Urban]

But we should add support to detect such new booleans, of course.

[Reini Urban]

Such support added with PR #198 via CORE_BOOL