Maximum recursion depth exceeded

[Kolajik]

• I have searched the issue tracker and believe that this is not a duplicate.

Make sure you run commands with -v flag before pasting the output.

Steps to reproduce

1. Initialize a PDM project with pdm init -n
2. Run pdm add -v "mlserver @ git+https://github.com/SeldonIO/MLServer.git@1.4.0"

Actual behavior

An error is being repeated endlessly for maximum recursion depth excession:

pdm.termui: Error parsing pyproject.toml, metadata may be incomplete.
group_dependencies: maximum recursion depth exceeded in comparison at line 111 col 0
pdm.termui: Error parsing pyproject.toml, metadata may be incomplete.
group_dependencies: maximum recursion depth exceeded while calling a Python object at line 107 col 0

Is this because MLServer is a poetry project?

Expected behavior

A dependency is added into pyproject.toml for the SeldonIO/MLServer git repository with specific git tag revision.

Environment Information

# Paste the output of `pdm info && pdm info --env` below:
pdm info --env
{
  "implementation_name": "cpython",
  "implementation_version": "3.11.9",
  "os_name": "posix",
  "platform_machine": "arm64",
  "platform_release": "23.5.0",
  "platform_system": "Darwin",
  "platform_version": "Darwin Kernel Version 23.5.0: Wed May  1 20:12:58 PDT 2024; root:xnu-10063.121.3~5/RELEASE_ARM64_T6000",
  "python_full_version": "3.11.9",
  "platform_python_implementation": "CPython",
  "python_version": "3.11",
  "sys_platform": "darwin"
}