[CHL] Drafting CEP to add --compat-level option to conda index
Resolves issues about older conda versions not understanding ~= MatchSpec operator introduced in conda 4.9.1/conda-build 3.20.5, without completely backing out the changes. (People who don't need backawards compatibility won't need to worry about it.)
Should this be --compat-level=4.8 or --compat-level=4.9? (Probably need to do a better job with SemVer)
[CHL] Other deprecations/compatibilty concerns to discuss
__glibc, __osx virtual packages (conda 4.8)
Run constrains (Spec added in conda ???)
Replacing MD5 with SHA256 (SHA256 added in conda ???)
license_family field; favor SPDX key in licenses
track_features, features (new option to deprioritize builds)
selectors in general
selectors without comments
Python 3.10
Anaconda, conda-forge working on building packages for RCs