Message 116345 - Python tracker

> Perhaps we can simply call Py_FatalError() instead? There's not much we
> can do when such a failure occurs anyway.

Sounds fine as well. Python's own usage definitely shouldn't fail. If
extension modules use this in an aggressive manner, they may actually
exhaust TLS keys (at least on Windows, where old versions had only
64 slots). Having the interpreter fail then sounds reasonable.