Fixes:
- PR #221 Fix struct-return ABI mismatch in XML_ExpatVersionInfo()
by parsing the version string instead of using the struct return,
which was corrupted when Perl and libexpat used different struct
return conventions (-fpcc-struct-return vs -freg-struct-return)
- PR #214 GH #211 GH #212 GH #213 Revert defaulthandle char
routing and standalone string changes that broke downstream CPAN
modules (XML-Twig, XML-DOM, XML-XPath)
- PR #216 GH #215 Increase deep_nesting test depth from 600 to
2048 to actually exercise the st_serial_stack reallocation code
path (the GH #39 fix)
- PR #218 Update expat download URL from SourceForge to GitHub in
the "expat not found" error message
Improvements:
- PR #220 GH #215 Add AddressSanitizer CI job for XS memory safety
to catch heap buffer overflows and use-after-free bugs
Maintenance:
- PR #219 Modernize last 4 print-ok test files (astress, namespaces,
stream, skip) to Test::More with descriptive test names
- PR #217 Remove obsolete .travis.yml (project uses GitHub Actions)