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

[Herringway]

On Sunday, 2 May 2021 at 12:21:53 UTC, Andrei Alexandrescu wrote:
> On 5/1/21 4:08 AM, Walter Bright wrote:
>> On 4/30/2021 3:03 PM, Andrei Alexandrescu wrote:
>>> This code should have NEVER been accepted upon review. 
>>> Instead, 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".
>>>
>>> This needs to be fixed, and very urgently.
>> 
>> Please file a bug report!

Here's the proposed patch and its review. I believe you may be 
able to understand why the reviewer didn't do those things. 
https://issues.dlang.org/show_bug.cgi?id=2996