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I wanted to add a test without antlr-python-runtime but I have no idea how to do that in the complex tox/conda-lock/extra env file setup here. If someone wants to add that note that we would need to call pytest with pytest cf_units/tests to avoid collecting import errors, or use -continue-on-collection-errors to continue.

I can attest that this works. All the functionalities but latex parsing are available and the import error is informative enough, if/when someone tries to use latex.