Revert "Temporarily pull in snapshot of PR #4246"

This reverts commit 23ac16e.

Author: rwgk

include/pybind11/detail/common.h

@@ -265,15 +265,6 @@
 #    define PYBIND11_HAS_U8STRING
 #endif
 
-// See description of PR #4246:
-#if !defined(NDEBUG) && !defined(PY_ASSERT_GIL_HELD_INCREF_DECREF)                                \
-    && !(defined(PYPY_VERSION)                                                                    \
-         && defined(_MSC_VER)) /* PyPy Windows: pytest hangs indefinitely at the end of the       \
-                                  process (see PR #4268) */                                       \
-    && !defined(PYBIND11_ASSERT_GIL_HELD_INCREF_DECREF)
-#    define PYBIND11_ASSERT_GIL_HELD_INCREF_DECREF
-#endif
-
 // #define PYBIND11_STR_LEGACY_PERMISSIVE
 // If DEFINED, pybind11::str can hold PyUnicodeObject or PyBytesObject
 //             (probably surprising and never documented, but this was the

include/pybind11/pytypes.h

@@ -246,11 +246,6 @@ class handle : public detail::object_api<handle> {
     const handle &inc_ref() const & {
 #ifdef PYBIND11_HANDLE_REF_DEBUG
         inc_ref_counter(1);
-#endif
-#if defined(PYBIND11_ASSERT_GIL_HELD_INCREF_DECREF)
-        if (m_ptr != nullptr && !PyGILState_Check()) {
-            throw std::runtime_error("pybind11::handle::inc_ref() PyGILState_Check() failure.");
-        }
 #endif
         Py_XINCREF(m_ptr);
         return *this;
@@ -262,11 +257,6 @@ class handle : public detail::object_api<handle> {
         this function automatically. Returns a reference to itself.
     \endrst */
     const handle &dec_ref() const & {
-#if defined(PYBIND11_ASSERT_GIL_HELD_INCREF_DECREF)
-        if (m_ptr != nullptr && !PyGILState_Check()) {
-            throw std::runtime_error("pybind11::handle::dec_ref() PyGILState_Check() failure.");
-        }
-#endif
         Py_XDECREF(m_ptr);
         return *this;
     }