• Added: Add environment variables to affect how signature_for checks
  appear in stack traces, debugging, and profiling.
  
• Added: Type::Params args objects now provide TO_LIST,
  TO_ARRAYREF, and TO_HASHREF methods.
  
• Added: Type::Params now provides hooks for the event of wrapping a sub
  in a signature.
  
• Minor optimization to avoid wrapping certain inlined checks in do {...}
  blocks.