[CHANGES]
- Added Scalar::Util::isbool() to track new core-supported boolean
value nature on scalars
- Fix various typoes in docs, code comments, etc...
- Removed code conditional on whether SvWEAKREF is supported, as
every perl since v5.6 supports it
[BUGFIXES]
- Fix segfaults when an undefined subroutine is passed to
block-taking subs (thanks ilmari)
- Correct refcount handling on hv_store_ent to PL_DBsub in
set_subname() (thanks nwc10)
- Don't rely on Scalar::Util functions when unit-testing List::Util
ones (thanks haarg)