old_contents: import binascii, os, random, json, hashlib
  
  bytes_from_int = chr if bytes == str else lambda x: bytes([x])
  
  def b2h(b):
      return binascii.hexlify(b).decode('utf-8')
  
  def random_hex(length):
      return binascii.b2a_hex(os.urandom(length))
  
  def double_hash(b): 
  	return hashlib.sha256(hashlib.sha256(b).digest()).digest()
  
  def inverse_hash(hashstring):
  	hashstring = hashstring[::-1]
  	return ''.join([hashstring[i:i+2][::-1] for i in range(0, len(hashstring), 2)])
  
  def ib2h(b):
  	return inverse_hash(b2h(b))
  
  class JsonDecimalEncoder(json.JSONEncoder):
      def default(self, o):
          if isinstance(o,  decimal.Decimal):
              return str(o)
          return super(DecimalEncoder, self).default(o)
  
  
  
  
  
new_contents: import binascii, os, random, json, hashlib
  
  bytes_from_int = chr if bytes == str else lambda x: bytes([x])
  
  def b2h(b):
      return binascii.hexlify(b).decode('utf-8')
  
  def random_hex(length):
      return binascii.b2a_hex(os.urandom(length))
  
  def double_hash(b): 
  	return hashlib.sha256(hashlib.sha256(b).digest()).digest()
  
  def inverse_hash(hashstring):
  	hashstring = hashstring[::-1]
  	return ''.join([hashstring[i:i+2][::-1] for i in range(0, len(hashstring), 2)])
  
  def ib2h(b):
  	return inverse_hash(b2h(b))
  
subject: Remove class `JsonDecimalEncoder`.