Is it possible to declare conflicting dependencies against published dependencies?

[winstxnhdw]

Question

I want my users to be able to install my package with the default portable scipy but also give them the option to install the Intel MKL accelerated scipy. Trying to to do this without defining conflicts leads to a conflicts error. This doesn't seem to be documented either.

[project]
requires-python = ">=3.9"
dependencies = ["scipy>=1.11.0", "scipy>=1.13.0; python_version >= '3.12'"]

[project.optional-dependencies]
intel = ["scipy>=1.13.1; python_version >= '3.11' and python_version < '3.13'"]

[tool.uv]
conflicts = [[{ extra = "intel" }, { group = "default" }]]  # declare default is conflicting
index = [
    { name = "intel", url = "https://software.repos.intel.com/python/pypi", explicit = true },
    { name = "pypi", url = "https://pypi.org/simple" },
]

[tool.uv.sources]
scipy = [
    { index = "intel", extra = "intel" },
    { index = "pypi" },
]

Platform

No response

Version

No response