The pymysql-feedstock from conda-forge

v0.10.0 incompatible with python3.8 from defaults channel

It seems as if the build for v0.10.0 is incompatible with the build of python3.8 from the defaults channel.

$ conda create -n test python=3.8.* pymysql=0.10.* --override-channels -c defaults -c conda-forge --strict-channel-priority

results in

UnsatisfiableError: The following specifications were found to be incompatible with each other:

Output in format: Requested package -> Available versions

Package python conflicts for:
pymysql=0.10 -> python
python=3.8
Note that strict channel priority may have removed packages required for satisfiability.

but giving priority to the conda-forge channel works:

$ conda create -n test python=3.8.* pymysql=0.10.* --override-channels -c conda-forge -c defaults --strict-channel-priority

gives:

Solving environment: done

## Package Plan ##

  environment location: /Users/xyz/miniconda2/envs/test

  added / updated specs:
    - pymysql=0.10
    - python=3.8


The following packages will be downloaded:

    package                    |            build
    ---------------------------|-----------------
    libcxx-10.0.1              |       h5f48129_0         1.0 MB  conda-forge
    pymysql-0.10.0             |     pyh9f0ad1d_0          42 KB  conda-forge
    python_abi-3.8             |           1_cp38           4 KB  conda-forge
    ------------------------------------------------------------
                                           Total:         1.0 MB

The following NEW packages will be INSTALLED:

  ca-certificates    conda-forge/osx-64::ca-certificates-2020.6.20-hecda079_0
  certifi            conda-forge/osx-64::certifi-2020.6.20-py38h32f6830_0
  libcxx             conda-forge/osx-64::libcxx-10.0.1-h5f48129_0
  libffi             conda-forge/osx-64::libffi-3.2.1-h4a8c4bd_1007
  ncurses            conda-forge/osx-64::ncurses-6.2-hb1e8313_1
  openssl            conda-forge/osx-64::openssl-1.1.1g-h0b31af3_0
  pip                conda-forge/noarch::pip-20.1.1-py_1
  pymysql            conda-forge/noarch::pymysql-0.10.0-pyh9f0ad1d_0
  python             conda-forge/osx-64::python-3.8.5-cpython_h85f3143_0
  python_abi         conda-forge/osx-64::python_abi-3.8-1_cp38
  readline           conda-forge/osx-64::readline-8.0-h0678c8f_2
  setuptools         conda-forge/osx-64::setuptools-49.2.0-py38h32f6830_0
  sqlite             conda-forge/osx-64::sqlite-3.32.3-h93121df_1
  tk                 conda-forge/osx-64::tk-8.6.10-hbbe82c9_0
  wheel              conda-forge/noarch::wheel-0.34.2-py_1
  xz                 conda-forge/osx-64::xz-5.2.5-h0b31af3_1
  zlib               conda-forge/osx-64::zlib-1.2.11-h0b31af3_1006

Since pymysql is a pure python package with no dependencies, I'm surprised that there is a conflict. Any ideas about what might be going on? I know that it can be problematic to mix packages form different channels, but typically if you use defaults as the primary channel and then only fall back to conda-forge for pure-python packages it works (or at least in the past it did).

@conda-forge/core

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v0.10.0 incompatible with python3.8 from defaults channel

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