From the docstring for Template: "Template objects created from the
constructor rather than an environment do have an `environment`
attribute that points to a temporary environment ..."
* Extract WSGIEnvironment in wsgiref.types
* Change value type of WSGIEnvironment to Any
Per PEP 3333, a WSGI environment can contain anything, not just strings.
* Replace `self` with `cls` in classmethod
* Group classmethods together, as in the actual stub
* Use float instead of Union[int, float] in coding style example
* Add stub for unittest.mock.patch.multiple()
* Use ... for default arguments in unittest.mock.patch() et al.
* Tighten type of create argument to patch() et al.
Sebastian Rittau