I find this a really elegant approach.

While the SC's decision to keep the syntax uniform is certainly laudable, it's 
creating the issue of packaging new complexities into a very limited syntactic 
& semantic space (e.g. no new magic symbols like "->", which I agree with BTW), 
leaving only very verbose solutions that the typing crowd is chafing against.

I think accepting that typing has a syntactic cost on the python language as a 
whole is unavoidable at some point (and I'm not saying that's a bad thing). 
Having a separate & opt-in mini-language for type declarations seems like a 
really clean way to delineate that cost resp. extension, and I especially like 
the t''-string syntax.

Best,
H.
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