round breaks on Decimal objects

[bwo]

$ python
Python 2.7.15 (tags/v2.7.15:ca079a3ea3, Apr 18 2019, 17:07:15)
[GCC 7.3.0] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from decimal import Decimal
>>> round(Decimal(4))
4.0
>>> from builtins import round
>>> round(Decimal(4))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/opt/source/.venv/lib/python2.7/site-packages/future/builtins/newround.py", line 42, in newround
    d = Decimal.from_float(number).quantize(exponent,
  File "/usr/local/lib/python2.7/decimal.py", line 690, in from_float
    n, d = abs(f).as_integer_ratio()
AttributeError: 'Decimal' object has no attribute 'as_integer_ratio'