Micromamba 2.0rc5 - libmamba Error parsing version ""

Troubleshooting docs

[X] My problem is not solved in the Troubleshooting docs

Anaconda default channels

[X] I do NOT use the Anaconda default channels (pkgs/* etc.)

How did you install Mamba?

Other (please describe)

Search tried in issue tracker

error parsing version

Latest version of Mamba

[X] My problem is not solved with the latest version

Tried in Conda?

Not applicable

Describe your issue

I tried the latest rc of micromamba 2.0rc5 as well as the latest master build #af81975 for windows. I noticed it did not work to create an environment from a yaml spec file because it would not accept versions of packages where it would request greater or lower than a certain version. If I make it greater or equal then it works.

Example of a YAML file that fails:

channels:
  - conda-forge
dependencies:
  - python > 3.11
  - numpy < 2.0

With this file if one would create an environment using micromamba create -f .\environment.yaml -p .\.env you get this fault:

critical libmamba Error parsing version "". Empty version.

One can make it not throw that error and create an environment just by changing the versions to this:

channels:
  - conda-forge
dependencies:
  - python >= 3.11
  - numpy <= 2.0

mamba info / micromamba info

No response

Logs

No response

environment.yml

channels:
  - conda-forge
dependencies:
  - python > 3.11
  - numpy < 2.0

~/.condarc

No response

mamba-org / mamba