Inside Google's main repo there are different build targets for libraries with incompatible API changes that are too difficult to fix all at once, e.g. there might be numpy_1_8 and numpy_1_10 separately.
Python at Google muddled along for years without numpy at all so it's not like anyone would be seriously harmed by having an old release in the repo.
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I think they do, but there is only ever one single version in use - the version in the repo.
Yes, and that prevents duplication of work when it's time to upgrade: https://github.com/microsoft/TypeScript/issues/33272
If so, they would have a massive problem upgrading libraries like numpy because there are too many and too big breaking changes between releases.
Inside Google's main repo there are different build targets for libraries with incompatible API changes that are too difficult to fix all at once, e.g. there might be numpy_1_8 and numpy_1_10 separately.
Python at Google muddled along for years without numpy at all so it's not like anyone would be seriously harmed by having an old release in the repo.