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On Mon, Jan 26, 2015, at 19:11, Steven D'Aprano wrote:
> random832@fastmail.us wrote:
> - lexical analysis has to look for twice as many files (it has to 
>   hit the hard drive for a stub file before looking at the source),
>   and we know from importing that file system access is a 
>   significant and expensive part of the process.

The idea is that the type hinting files would not participate in
execution at all, only static analysis, so the interpreter doesn't need
to look for these things at all, it only needs to ignore them.