Install Extras to markers with required baseline installation?

Description

I'm not sure if this is a bug report or a feature request.

I found the excellent PR "Pass Install Extras to Markers" https://github.com/python-poetry/poetry/pull/9553

I tried the same idea, but that the default (no extra) installation would install the package.

What I want:

poetry install -> install requests lib with no extras
poetry install -E requests_abc -> install requests lib with "abc" extra.

I tried this snippet:

[tool.poetry.dependencies]
python = "^3.10"
requests = [
    { markers = "extra != 'requests_abc'", version = "8.1.2"},
    { markers = "extra == 'requests_abc'", version = "8.1.2", extras=["abc"] }
 ]

[tool.poetry.extras]
requests_abc = ["requests"]

But when I install poetry without any extra, I don't get the requests package at all. In poetry.lock file, I see that the package has optional=true. What am I doing wrong, or is this a bug or an unsupported feature?

Workarounds

None that I know of

Poetry Installation Method

pipx

Operating System

Mac OSX

Poetry Version

2.1.2

Poetry Configuration

cache-dir = "/Users/noamgat/Library/Caches/pypoetry"
data-dir = "/Users/noamgat/Library/Application Support/pypoetry"
installer.max-workers = null
installer.no-binary = null
installer.only-binary = null
installer.parallel = true
installer.re-resolve = true
keyring.enabled = true
python.installation-dir = "{data-dir}/python"  # /Users/noamgat/Library/Application Support/pypoetry/python
repositories.repo.url = "https:///"
requests.max-retries = 0
solver.lazy-wheel = true
system-git-client = false
virtualenvs.create = true
virtualenvs.in-project = true
virtualenvs.options.always-copy = false
virtualenvs.options.no-pip = false
virtualenvs.options.system-site-packages = false
virtualenvs.path = "{cache-dir}/virtualenvs"  # /Users/noamgat/Library/Caches/pypoetry/virtualenvs
virtualenvs.prompt = "{project_name}-py{python_version}"
virtualenvs.use-poetry-python = false

Python Sysconfig

Paste the output of 'python -m sysconfig', over this line.

Example pyproject.toml

Poetry Runtime Logs

Paste the output of 'poetry -vvv <command>', over this line.

Start by reproducing the dependency declaration from the issue in a pyproject.toml and compare poetry install with poetry install -E requests_abc, then inspect the resulting poetry.lock entry. Done means the default installation includes requests while the named extra also enables its abc extra, or the behavior is documented as unsupported.