code: def bigint_to_string(val):
      
      if isinstance(val, _NUMBERS) and not abs(val) <= 2**53-1:
          return str(val)
      return val
docs: Converts @val to a string if it is a big integer (|>2**53-1|)
  
          @val: #int or #float
  
          -> #str if @val is a big integer, otherwise @val