GHC proposals not rendering

[Simon Peyton Jones]

If you go to https://github.com/ghc-proposals/ghc-proposals/pull/448, and
click on the "rendered" link, namely
https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0448-type-variable-scoping.rst,
Github is now displaying the .rst source, not the rendered proposal.

This has started happening (consistently across other proposals) today.

Does anyone know why?  How can I fix this?

Simon
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