text: Title: Do not deserializing to python decimal.Decimal is a nightmare for floating numbers in JSON
  Body: Python uses floats for it's JSON library. Herein lies the problems.
  
  $ python
  >>> import json
  >>> json.dumps(10.001)
  '10.000999999999999'
  >>> json.loads('{"blaa": 0.333331}')
  {u'blaa': 0.33333099999999999}
  >>> type(json.loads('{"blaa": 0.333331}')['blaa'])
  <type 'float'>
  
  This is unacceptable.
  
  see https://bitcointalk.org/index.php?topic=4086.msg58882#msg58882
  
  In fact, it’s impossible to customize the behaviour of orjson to map to decimal values. This is weird.