use GetFlags

Author: MilesCranmer

src/C/extras.jl

@@ -8,7 +8,7 @@ Py_TypeCheck(o, t) = Base.GC.@preserve o t PyType_IsSubtype(Py_Type(asptr(o)), a
 Py_TypeCheckFast(o, f::Integer) = Base.GC.@preserve o PyType_IsSubtypeFast(Py_Type(asptr(o)), f)
 
 PyType_IsSubtypeFast(t, f::Integer) =
-    Base.GC.@preserve t Cint(!iszero(UnsafePtr{PyTypeObject}(asptr(t)).flags[] & f))
+    Base.GC.@preserve t Cint(!iszero(PyType_GetFlags(asptr(t)) & f))
 
 PyMemoryView_GET_BUFFER(m) = Base.GC.@preserve m Ptr{Py_buffer}(UnsafePtr{PyMemoryViewObject}(asptr(m)).view)
 

src/C/pointers.jl

@@ -80,6 +80,8 @@ const CAPI_FUNC_SIGS = Dict{Symbol,Pair{Tuple,Type}}(
     :PyType_FromSpec => (Ptr{PyType_Spec},) => PyPtr,
     :PyType_FromSpecWithBases => (Ptr{PyType_Spec}, PyPtr) => PyPtr,
     :PyType_GetSlot => (PyPtr, Cint) => Ptr{Cvoid},
+    :PyType_GetFlags => (PyPtr,) => Culong,
+    # TODO: PyType_GetName, once we are Python 3.11+ exclusively
     # MAPPING
     :PyMapping_HasKeyString => (PyPtr, Ptr{Cchar}) => Cint,
     :PyMapping_SetItemString => (PyPtr, Ptr{Cchar}, PyPtr) => Cint,