poetry add fails to update constraint for packages with a capitalized name

console.log

$ poetry add -vvv django=~4.0.0
Using virtualenv: /home/slate/.cache/pypoetry/virtualenvs/demo-hKjNfXom-py3.10
PyPI: No release information found for django-1.0.1, skipping
PyPI: No release information found for django-1.0.2, skipping
PyPI: No release information found for django-1.0.3, skipping
PyPI: No release information found for django-1.0.4, skipping
PyPI: No release information found for django-1.1, skipping
PyPI: No release information found for django-1.1.1, skipping
PyPI: No release information found for django-1.1.2, skipping
PyPI: 6 packages found for django >=4.0.0,<4.1.0

Updating dependencies
Resolving dependencies...
   1: fact: demo is 0.1.0
   1: derived: demo
   0: Duplicate dependencies for django
   1: fact: demo depends on django (^3.2.12)
   1: fact: demo depends on Django (~4.0.0)
   1: selecting demo (0.1.0)
   1: derived: Django (>=4.0.0,<4.1.0)
   1: conflict: demo depends on django (^3.2.12)
   1: ! not  django (^3.2.12) is satisfied by  Django (~4.0.0)
   1: ! which is caused by "demo depends on Django (~4.0.0)"
   1: ! thus: version solving failed
   1: Version solving took 0.004 seconds.
   1: Tried 1 solutions.

  Stack trace:

  8  ~/.local/pipx/venvs/poetry/lib/python3.10/site-packages/clikit/console_application.py:131 in run
      129│             parsed_args = resolved_command.args
      130│ 
    → 131│             status_code = command.handle(parsed_args, io)
      132│         except KeyboardInterrupt:
      133│             status_code = 1

  7  ~/.local/pipx/venvs/poetry/lib/python3.10/site-packages/clikit/api/command/command.py:120 in handle
      118│     def handle(self, args, io):  # type: (Args, IO) -> int
      119│         try:
    → 120│             status_code = self._do_handle(args, io)
      121│         except KeyboardInterrupt:
      122│             if io.is_debug():

  6  ~/.local/pipx/venvs/poetry/lib/python3.10/site-packages/clikit/api/command/command.py:171 in _do_handle
      169│         handler_method = self._config.handler_method
      170│ 
    → 171│         return getattr(handler, handler_method)(args, io, self)
      172│ 
      173│     def __repr__(self):  # type: () -> str

  5  ~/.local/pipx/venvs/poetry/lib/python3.10/site-packages/cleo/commands/command.py:92 in wrap_handle
       90│         self._command = command
       91│ 
    →  92│         return self.handle()
       93│ 
       94│     def handle(self):  # type: () -> Optional[int]

  4  ~/.local/pipx/venvs/poetry/lib/python3.10/site-packages/poetry/console/commands/add.py:173 in handle
      171│             self._installer.whitelist([r["name"] for r in requirements])
      172│ 
    → 173│             status = self._installer.run()
      174│         except BaseException:
      175│             # Using BaseException here as some exceptions, eg: KeyboardInterrupt, do not inherit from Exception

  3  ~/.local/pipx/venvs/poetry/lib/python3.10/site-packages/poetry/installation/installer.py:103 in run
      101│         local_repo = Repository()
      102│ 
    → 103│         return self._do_install(local_repo)
      104│ 
      105│     def dry_run(self, dry_run=True):  # type: (bool) -> Installer

  2  ~/.local/pipx/venvs/poetry/lib/python3.10/site-packages/poetry/installation/installer.py:235 in _do_install
      233│             )
      234│ 
    → 235│             ops = solver.solve(use_latest=self._whitelist)
      236│         else:
      237│             self._io.write_line("Installing dependencies from lock file")

  1  ~/.local/pipx/venvs/poetry/lib/python3.10/site-packages/poetry/puzzle/solver.py:65 in solve
       63│         with self._provider.progress():
       64│             start = time.time()
    →  65│             packages, depths = self._solve(use_latest=use_latest)
       66│             end = time.time()
       67│ 

  SolverProblemError

  Because demo depends on both django (^3.2.12) and Django (~4.0.0), version solving failed.

  at ~/.local/pipx/venvs/poetry/lib/python3.10/site-packages/poetry/puzzle/solver.py:241 in _solve
      237│             packages = result.packages
      238│         except OverrideNeeded as e:
      239│             return self.solve_in_compatibility_mode(e.overrides, use_latest=use_latest)
      240│         except SolveFailure as e:
    → 241│             raise SolverProblemError(e)
      242│ 
      243│         results = dict(
      244│             depth_first_search(
      245│                 PackageNode(self._package, packages), aggregate_package_nodes

pyproject.toml

[tool.poetry]
name = "demo"
version = "0.1.0"
description = ""
authors = ["Shai Berger <shai@platonix.com>"]
license = "MIT"

[tool.poetry.dependencies]
python = "^3.10"
django = "^3.2.12"

[tool.poetry.dev-dependencies]

[build-system]
requires = ["poetry-core>=1.0.0"]
build-backend = "poetry.core.masonry.api"