* Remove "typing." prefix from compiled signature param
* Don't print default "None" for Optional params
* Don't remove 'typing.' prefix if symbol doesn't come from typing module
* Revert "Don't print default "None" for Optional params"
This reverts commit 8db334d9bb.
* Make sure "typing." doesn't appear in the middle
* Make sure only "typing." prefix is removed and not it's entries in the middle
* Use inspect.formatannotation() to create an annotation string
* Update AUTHORS.txt
* Add test for compiled param annotation string
* Replace Optional in test with other typing facilities
in order for test to be forward-compatible with 3.9
* Add an empty string fallback for Python 2
* Move _annotation_to_str back to original position
