• Chg : The new environment variable to enable thread tests on older
  perls is PERL_FORCE_TEST_THREADS. Note that this variable
  should only be turned on by authors.
  
• Fix : Segfaults when the module is loaded by several threads (or
  Windows emulated processes) ran in parallel.
  
• Fix : Segfaults when the module is loaded in a thread, which spawns
  itself a new thread, and that child thread outlives its parent.
  
• Fix : Small memory leaks of structures required for thread safety.
  
• Fix : Update the Windows ActivePerl + gcc 3.4 workaround for
  ExtUtils::MakeMaker 7.04. Thanks Christian Walde for reporting
  and feedback on this issue.
  
• Tst : The global destruction test will now be exercised on any perl
  that has DEBUGGING set.
  
• Tst : Optional capturing tests in t/17-ctl.t that were only run when
  Capture::Tiny was present were converted to an IPC::Open3
  based helper and will now be run everywhere.