[CHANGES]
- Preëmptively use Future ->udata API from upcoming release, to
avoid depending on it being a hashref
- Report correct caller file + line number in nested test calls to
wait_for {}
[BUGFIXES]
- Use 'SOCK_STREAM' instead of hardcoded 1 in t/50resolver.t
- Skip exceptional socket condition test on cygwin because it seems
always to fail there
- Avoid harmless warnings about undef at global destruction
(RT142754)