• Change encode of numbers with dual-strings (int and float), integers
  and numbers are now not mishandled anymore by dual-vars, temp. string representations.
  Add t/117_numbers.t from JSON::PP, PR#10 by kraih.
  
• Add prompt for nan/inf encode policy: null or stringify.
  
• Change stringification of false and true to 0 and 1, matching upstream JSON and JSON::XS, #29.
  This didn't affect string comparisons, just e.g. print decode_json("false").
  
• Tolerate literal ASCII TABs in strings in relaxed mode #22 (from JSON::XS)
  
• Revise pod, merge updates from JSON::XS.
  
• Fix pod typo #30 (Colin Kuskie)