he/him 
Optimising for…of based on flow types and some basic type inference.pic.twitter.com/dsh59HrQj6
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@sebmck can this lead to compile time errors? (Like when assigning to const) or perhaps runtime type checks?
@ncreen_same Possibly, although it'd be pretty limited and the cases it wouldn't pick up would fail silently and it'd be pretty dangerous.
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@sebmck this does make senseThanks. Twitter will use this to make your timeline better. UndoUndo
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