Changes for version 0.52
- plan() now better checks that the given plan is valid.
- rt.cpan.org 2597
Changes for version 0.51_02
- is_deeply() and all the eq_* functions now handle circular data structures. [rt.cpan.org 7289]
- require_ok() now handles filepaths in addition to modules.
- Clarifying Test::More's position on overloaded objects
- Fixed a bug introduced in 0.51_01 causing is_deeply() to pierce overloaded objects.
- Mentioning rt.cpan.org for reporting bugs.
Changes for version 0.51_01
- plan() was accidentally exporting functions [rt.cpan.org 8385]
- diag @msgs would insert # between arguments. [rt.cpan.org 8392]
- eq_set() could cause problems under threads due to a weird sort bug
- rt.cpan.org 6782
- undef no longer equals '' in is_deeply() [rt.cpan.org 6837]
- is_deeply() would sometimes compare references as strings.
- rt.cpan.org 7031
- eq_array() and eq_hash() could hold onto references if they failed keeping them in memory and preventing DESTROY. [rt.cpan.org 7032]
- is_deeply() could confuse  with a non-existing value
- rt.cpan.org 7030
- is_deeply() diagnostics a little off when scalar refs were inside an array or hash ref [rt.cpan.org 7033]
- Thanks to Fergal Daly for ferretting out all these long standing is_deeply and eq_* bugs.