• Add support for escape_slash from JSON::PP. #47
  
• Map sort_by to canonical from JSON::PP. #47
  reverse sort or sort by custom keys not yet possible/silently ignored.
  
• Add support for allow_singlequote from JSON::PP. #47
  
• Add support for allow_barekey from JSON::PP. #47
  
• Add support for allow_bignum from JSON::PP. #47
  
• relaxed uses now also allow_singlequote and allow_barekey.
  
• Fixed t/20_unknown.t: SKIP when JSON is not available. #45
  
• Fixed t/55_modifiable.t: Broaden the is check of true <5.12 #45
  (both reported by Paul Howarth)
  
• Add t/zero-mojibake.t from JSON::PP testing all supported decoding
  options: none, utf8, ascii, latin1, binary.