What's the deal with the massive duplication in std.meta?

[Nick Treleaven]

On Friday, 30 April 2021 at 22:03:41 UTC, Andrei Alexandrescu 
wrote:
> the reviewers should have filed a TOP PRIORITY bug report to 
> dmd "Not binding types to alias templates forces unscalable 
> code duplication for all typelist primitives".

I think that did get fixed. At the time, I tried to remove the 
overloads in std.meta, but ran into another bug:
https://github.com/dlang/phobos/pull/7513#issuecomment-638946029

I made a dmd pull to fix that bug, but I wasn't too confident 
about its correctness, and the fix didn't get merged.