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type hinting backward compatibility with python 3.0 to 3.4

Chris Angelico wrote:
> With mypy, if your classes
> are too dynamic, you might have to create a stub file that's more
> static (but non-functional) just for the type checking. Can you do
> that if your type checker is part of the language?

I think you may have misunderstood. I'm not suggesting that
the runtime interpreter should perform static type checking.
I'm only suggesting that it should treat type annotations
completely passively -- essentially as comments that are
constrained to have the syntax of expressions.

The type checking itself would still be done as a separate
operation that can use stub files, etc. just the same as
mypy does now.