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This module represents the various types of requirement that can be specified for
a project. It is somewhat redundant to re-implement here as we could use
`pip.req.InstallRequirement`, but that would require depending on pip which is not
easy to do since it will usually be installed by the user at a specific version.
Additionally, the pip implementation has a lot of extra features that we don't need -
we don't expect relative file paths to exist, for example. Note that the parsing here
is also intentionally more lenient - it is not our job to validate the requirements
list.
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