pybind11

feat(subinterpreter): reusable PyThreadState via subinterpreter_thread_state (#6073)

Fix custom __str__ for enum_ (#6078)

Apply -undefined dynamic_lookup to all Apple platforms (#6075)

chore(deps): bump idna from 3.7 to 3.15 in /docs (#6074)

[skip ci] test: reject shared_ptr casts for custom holders (#6069)