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Clarify documentation around global sources #5062
A lot of that confusion is likely our fault as a team—we often weren't sure what was and wasn't possible even as we were trying to fix the problem. As the above-linked blog post mentions, the only way to be 100% safe in Bundler 1.x is to have no global sources.
The cross-source confusion is eliminated in the (as yet unreleased) Bundler 2.x series by a series of backwards-compatibility breaking changes to the format of the
As a result of these problems, let's try to make it clearer for users what they need to do:
This is a good chance for anyone to contribute, even if they aren't familiar with the Bundler code, since the explanations and warnings have all already been written down at least once.