Slugify and python-slugify cannot coexist with new run_constrained

[FaustinCarter]

Solution to issue cannot be found in the documentation.

• I checked the documentation.

Issue

Run: conda install slugify python-slugify. This returns an unsolvable environment specs error. This is likely because slugify is being pinned here to "less than version 0", but the only version of slugify that exists on conda-forge is 0.0.1. In fact, I don't even know how a "less than 0" pin even works.

@bollwyvl Can you check this out please? This is breaking lots of stuff.

Installed packages

Base miniconda install on Windows, Python=3.10

Environment info

Here's the releveant bits. Rest is censored:


          conda version : 22.11.1
    conda-build version : 3.23.3
         python version : 3.10.8.final.0
       virtual packages : __archspec=1=x86_64
                          __win=0=0

[bollwyvl]

They couldn't before, either, as one would clobber the other, as they are both imported as slugify, and both populate bin/slugify.

see: #33

run_constrained just means "if this other thing is installed, it must be this version".

[FaustinCarter]

So in this case <0 is a nuclear option to break the possibility of that happening?