Should there be more than one add-on repository?

[ccaprani]

ReadMe:

Since there is a lot of code that we may not want in the main repository, does it make sense to have more than one additional repository? For exmaple, pymc-experimental may just include methods that are not fully developed, tested and trusted, while code that is known to work well and has adequate test coverage could reside in a pymc-extras (or similar) repository.

The trade-off here seems to be around ease of use; package count; pymc stability; and pymc maintenance burden.

IMHO: one additional repo should be enough; tests etc should be a requirement of pymc-experimental just as for pymc; indeed, once the maintainers are satisfied with a feature stability, the code should require no further development to just lift straight into pymc.