Currently MSVC can not build subspace.
17.4.2 works ✅
17.6.3 does not 🚫

Github windows-latest has upgraded to 17.6.3 so we can't run MSVC bots.
Github windows-2019 has MSVC 16 which was also not capable of building all the C++20 stuff in Subspace.

Upstream bug with MSVC: https://developercommunity.visualstudio.com/t/Update-to-1763-now-rejects-valid-C-i/10394500

Disabled here: 091aee4