poetry install not removing previous version of package under development

[ghost]

• I am on the latest Poetry version.

• I have searched the issues of this repo and believe that this is not a duplicate.

• OS version and name: Arch Linux

• Poetry version: 1.1.4

• Link of a Gist with the contents of your pyproject.toml file: https://github.com/ns-admetrics/poetry-version-bumping/blob/main/pyproject.toml

• System Python: 3.9

• poetry env Python versions 3.7 (main), 3.8, 3.9

Issue

When I bump the version of the package I'm developing (e.g. with python version minor), and run poetry install, then I end up with multiple versions of it in $(poetry env info -p)/lib/python3.7/site-packages, e.g.

mypackage.pth
mypackage-0.1.0a1.dist-info
mypackage-0.1.0a2.dist-info
mypackage-0.1.0.dist-info
mypackage-0.2.0.dist-info

My expectation is that poetry install would declaratively install the version that is currently defined in pyproject.toml, and remove other versions.

Is this expectation incorrect? I don't see a poetry clean type command; maybe there is another intended way to bump versions.

Here's a setup that reproduces (not quite portable): https://github.com/ns-admetrics/poetry-version-bumping/blob/main/playbook.sh

_{For prereleases at least (0.1.0-alpha.N), it seems a bit undeterministic what is seen as "the installed package version" then, e.g. what `pip uninstall mypackage` removes, but also the [recommended approach](https://github.com//pull/2366#issuecomment-652418094) to deal with `__version__` redundancy breaks. This latter might be an upstream bug in `importlib_metadata`; when there's 0.1.0a1, 0.1.0a2 and 0.1.0, then 0.1.0a1 is picked -- mentioning only for context.}

[finswimmer]

I guess this a duplicate of #2855, is it?

[ghost]

Right, my issue search foo failed me spectacularly, apologies. Time to fix this (linked draft PR) :)

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