remove install dependency on typing #167
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This removes our install dependency on typing and adds shims on failed imports where necessary.
Issue #, if available:
fixes #166
Description of changes:
I was unable to duplicate the reported issue that triggered #166, but after considering how we are actually using
typing(ie: only for typehints), I think that the right answer is to remove our install dependency entirely.We only need
typingto actually exist and work correctly when we do our type analysis, and we always run that with a version newer than 3.5.2, and the shims let the code work as intended whentypingis not present.By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.