Change description of float('nan') feature; NaNs don't care much about signs, and float('nan'), float('+nan') and float('-nan') actually all generate the exact same NaN value.
Change description of float('nan') feature; NaNs don't care much about
signs, and float('nan'), float('+nan') and float('-nan') actually all
generate the exact same NaN value.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator