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Add initial support for the "pre" option in Pipfile
The issue
This PR adds initial support for the pre Pipfile option discussed in https://github.com/pypa/pipenv/issues/1760
It touches a lot of vendored dependencies and I'm not sure that this is the right way to do it but seems like this is the smallest possible change.
The checklist
- [ ] Associated issue
- [ ] A news fragment in the
news/directory to describe this fix with the extension.bugfix,.feature,.behavior,.doc..vendor. or.trivial(this will appear in the release changelog). Use semantic line breaks and name the file after the issue number or the PR #.
Would love for this to be fixed. One suggestion: can you change the name of the flag to allow_prereleases like the global flag and make it more verbose?
@kleschenko are you still interested in working on this? I am thinking though because this is already supported, the pre option, that we may just be able to close this PR?
This won't be possible unless the pip resolver supported the pre option on a per-package level instead of a global level.