float() does not behave the same as CPython #908

Right now the transcrypted float() uses JS parseFloat, but parseFoat allows for non-numeric values in the string it is partsing. It jsut stops parsing when it hits a non-numeric value instead of throwing NaN. CPython will instead raise a ValueError.

parseFloat("123.pdf")
123

float("123.pdf")
Traceback (most recent call last):
  File "/opt/pycharm/plugins/python-ce/helpers/pydev/pydevconsole.py", line 364, in runcode
    coro = func()
  File "<input>", line 1, in <module>
ValueError: could not convert string to float: '123.pdf'

Maybe use Number instead of parseFloat?

Update: float() is also returning NaN in some cases without throwing an error.