Phobos version naming

[Paul Backus]

On Wednesday, 3 November 2021 at 15:37:05 UTC, Andrei 
Alexandrescu wrote:
> Currently it's std.v2 but I'm unclear how it goes from there. 
> By semver we'd go with std.v2_0_1 and so on.

This seems like a misuse of semver to me. Backwards-compatible 
bugfixes and additions to std.v2 can go directly into std.v2, 
just like they currently do for std. There is no need to create 
separate packages for every minor and patch increment.

If we really want to support users depending on a specific 
minor/patch release of Phobos other than the one shipped with 
their D toolchain, we should put Phobos on code.dlang.org.