• New feature: sort tied hashes with canonical. (GH #167)
  
• Fix encode of threads::shared boolean (#166 Sam Bingner).
  This was broken with 4.00.
  
• Fix some stringify overload cases via convert_blessed (GH #105)
  
• Fix a compat case with JSON::XS, when convert_blessed is set, but
  allow_blessed not. (GH #105)
  
• Improve blessed and stringify tests
  
• Work on better inf/nan detection on AIX (#165 Peter Heuchert)
  
• Fix documentation for booleans and their types (#162 by Karen Etheridge)