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

[Andrei Alexandrescu]

On 5/1/21 6:26 AM, Nick Treleaven wrote:
> On Saturday, 1 May 2021 at 10:23:26 UTC, Nick Treleaven wrote:
>> 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.
> 
> https://github.com/dlang/dmd/pull/11320

Thanks! This is important work.

I see Iain mentioned it breaks existing behavior. What is the policy for 
breaking broken behavior? We shouldn't deprecate it, but there should be 
a compatibility switch or something.

Walter, what's the plan here?