Problem installing aio-pika package

[multiart]

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

Steps to reproduce

pdm add aio-pika

Actual behavior

root@9120223ba54d:/app# pdm add aio-pika --verbose
Adding packages to default dependencies: aio-pika
======== Start resolving requirements ========
        uvicorn~=0.13
        fastapi~=0.63
        aio-pika
        Adding requirement uvicorn~=0.13
        Adding requirement fastapi~=0.63
        Adding requirement aio-pika
Traceback (most recent call last):
  File "/usr/local/lib/python3.9/site-packages/pdm/resolver/core.py", line 23, in _merge_into_criterion
    crit = self.state.criteria[name]
KeyError: 'aio-pika'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/bin/pdm", line 8, in <module>
    sys.exit(main())
  File "/usr/local/lib/python3.9/site-packages/pdm/core.py", line 73, in __call__
    return self.main(*args, **kwargs)
  File "/usr/local/lib/python3.9/site-packages/pdm/core.py", line 112, in main
    raise err.with_traceback(traceback)
  File "/usr/local/lib/python3.9/site-packages/pdm/core.py", line 108, in main
    f(options.project, options)
  File "/usr/local/lib/python3.9/site-packages/pdm/cli/commands/add.py", line 35, in handle
    actions.do_add(
  File "/usr/local/lib/python3.9/site-packages/pdm/cli/actions.py", line 163, in do_add
    resolved = do_lock(project, strategy, tracked_names, reqs)
  File "/usr/local/lib/python3.9/site-packages/pdm/cli/actions.py", line 68, in do_lock
    mapping, dependencies, summaries = resolve(
  File "/usr/local/lib/python3.9/site-packages/pdm/resolver/core.py", line 135, in resolve
    result = resolver.resolve(requirements)
  File "/usr/local/lib/python3.9/site-packages/resolvelib/resolvers.py", line 453, in resolve
    state = resolution.resolve(requirements, max_rounds=max_rounds)
  File "/usr/local/lib/python3.9/site-packages/resolvelib/resolvers.py", line 318, in resolve
    name, crit = self._merge_into_criterion(r, parent=None)
  File "/usr/local/lib/python3.9/site-packages/pdm/resolver/core.py", line 25, in _merge_into_criterion
    crit = Criterion.from_requirement(self._p, requirement, parent)
  File "/usr/local/lib/python3.9/site-packages/resolvelib/resolvers.py", line 79, in from_requirement
    cands = build_iter_view(provider.find_matches([requirement]))
  File "/usr/local/lib/python3.9/site-packages/resolvelib/structs.py", line 148, in build_iter_view
    matches = list(matches)
  File "/usr/local/lib/python3.9/site-packages/pdm/resolver/providers.py", line 117, in find_matches
    yield from super().find_matches(requirements)
  File "/usr/local/lib/python3.9/site-packages/pdm/resolver/providers.py", line 44, in find_matches
    candidates = self.repository.find_candidates(
  File "/usr/local/lib/python3.9/site-packages/pdm/models/repositories.py", line 104, in find_candidates
    sorted_cans = sorted(
  File "/usr/local/lib/python3.9/site-packages/pdm/models/repositories.py", line 109, in <genexpr>
    and (allow_all or requires_python.is_subset(c.requires_python))
  File "/usr/local/lib/python3.9/site-packages/pdm/models/specifiers.py", line 403, in is_subset
    other = type(self)(str(other))
  File "/usr/local/lib/python3.9/site-packages/pdm/models/specifiers.py", line 89, in __init__
    self._analyze_specifiers()
  File "/usr/local/lib/python3.9/site-packages/pdm/models/specifiers.py", line 118, in _analyze_specifiers
    new_lower = bump_version(version)
  File "/usr/local/lib/python3.9/site-packages/pdm/models/specifiers.py", line 33, in bump_version
    head, value = version[:index], int(version[index])
ValueError: invalid literal for int() with base 10: '*'

Expected behavior

aio-pika package installation

Environment Information

# `pdm info && pdm info --env`:
PDM version:        1.2.0.post1                  
Python Interpreter: /usr/local/bin/python (3.9.1)
Project Root:       /app                         
root@9120223ba54d:/app# pdm info --env
{
  "implementation_name": "cpython",
  "implementation_version": "3.9.1",
  "os_name": "posix",
  "platform_machine": "x86_64",
  "platform_release": "4.19.128-microsoft-standard",
  "platform_system": "Linux",
  "platform_version": "#1 SMP Tue Jun 23 12:58:10 UTC 2020",
  "python_full_version": "3.9.1",
  "platform_python_implementaiton": "CPython",
  "python_version": "3.9",
  "sys_platform": "linux"
}