• Loader: Support stringification of complex mapping keys
  
• Improve regexes for mapping keys, tags, anchors/aliases
  
• Improve number support (int, float, oct, hex)
  
• Reserved directives generate a warning now
  
• Support Carriage Return as line break
  
• Support missing final line break
  
• Make JSON::PP optional in test
  
• Fix bug for perl <= 5.22