Issue #5781: Only use legacy string<->double conversions when we can't figure out how to get and set the x87 control word.
Issue #5781: Only use legacy string<->double conversions when
we can't figure out how to get and set the x87 control word.

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