Support for PYPY?

When building the quil recipe for conda-forge with the pypy implementationthis error occurs:

error[E0432]: unresolved import `rigetti_pyo3::pyo3::types::PyFunction`
  --> quil-py/src/program/mod.rs:23:26
   |
23 |         types::{PyBytes, PyFunction, PyList},
   |                          ^^^^^^^^^^
   |                          |
   |                          no `PyFunction` in `types`
   |                          help: a similar name exists in the module: `PyCFunction`
   |
note: found an item that was configured out
  --> /home/conda/feedstock_root/build_artifacts/quil-split_1714521268342/_build_env/.cargo/registry/src/index.crates.io-6f17d22bba15001f/pyo3-0.20.3/src/types/mod.rs:26:25
   |
26 | pub use self::function::PyFunction;
   |                         ^^^^^^^^^^

For more information about this error, try `rustc --explain E0432`.
error: could not compile `quil-py` (lib) due to 1 previous error

Start with quil-py/src/program/mod.rs and the PyO3 0.20.3 error showing that PyFunction is configured out under PyPy. Trace how the quil recipe selects the PyPy implementation and identify the compatibility boundary. Done means the quil recipe builds successfully with PyPy without this unresolved import.