Template method call returns a TemplateProxy instead of result

The following code:

>>> import ROOT

>>> ROOT.TMath.Sign(211,1)

<ROOT.TemplateProxy object at 0x7fd32fd02890>

returns a TemplateProxy instead of the result of running Sign, which should be:

>>> import ROOT

>>> ROOT.TMath.Sign(211,1)

211.0

The issue is solved in PyROOT experimental.