[Code scan] Python 3.7 metadata is incompatible with typeguard>=4 dependency

[njzjz]

This issue was found by a Codex global code scan of the repository.

Affected code:

dargs/pyproject.toml

Lines 14 to 22 in b4db564

	classifiers = [
	"Programming Language :: Python :: 3.7",
	"License :: OSI Approved :: GNU Lesser General Public License v3 (LGPLv3)",
	]
	dependencies = [
	"typeguard>=4",
	'typing_extensions; python_version < "3.8"',
	]
	requires-python = ">=3.7"

Problem:
The project metadata advertises Python 3.7 support with requires-python = ">=3.7" and a Python 3.7 classifier, but the runtime dependency is typeguard>=4. pip cannot satisfy typeguard>=4 for Python 3.7, because the available typeguard 4.x releases require at least Python 3.7.4 or newer, and later releases require Python 3.8/3.9+.

Reproducer:

python -m pip download 'typeguard>=4' --python-version 37 --only-binary=:all: --no-deps -d /tmp/dargs-pip-37

Observed behavior:

ERROR: Could not find a version that satisfies the requirement typeguard>=4

Expected behavior:
The package metadata should either raise the minimum Python version to the actual supported floor, or constrain dependencies with environment markers so installation remains solvable for advertised Python versions.