Package is hard to install from PyPI

[astoff]

Because the dependency versions in pyproject.py are pinned to specific versions, it's hard to use this package as a library in a project that has other dependencies.

I would suggest to do take the usual approach for libraries (make the pyproject.toml version restrictions as broad as possible) and save a "frozen" requirements.txt file separately for the app (or wherever else you require 100% reproducible results).