pyo3_ffi

Constant Py_TPFLAGS_HAVE_VECTORCALL

Source 
pub const Py_TPFLAGS_HAVE_VECTORCALL: c_ulong = _; // 2_048u64
Available on Py_3_12, or Py_3_8 and non-Py_LIMITED_API only.
Expand description

Set if the type implements the vectorcall protocol (PEP 590)