diff --git a/dtool/metalibs/dtoolconfig/pydtool.cxx b/dtool/metalibs/dtoolconfig/pydtool.cxx
index 0293df157f..3d0e149bc9 100644
--- a/dtool/metalibs/dtoolconfig/pydtool.cxx
+++ b/dtool/metalibs/dtoolconfig/pydtool.cxx
@@ -45,6 +45,17 @@ static PyObject *_inP07ytDId0(PyObject *self, PyObject *args);
 static PyObject *_inP07ytHuAm(PyObject *self, PyObject *args);
 static PyObject *_inP07yt_xr0(PyObject *self, PyObject *args);
 static PyObject *_inP07ytH5qp(PyObject *self, PyObject *args);
+static PyObject *_inP07ytLfJw(PyObject *self, PyObject *args);
+static PyObject *_inP07yt_Atg(PyObject *self, PyObject *args);
+static PyObject *_inP07ytlBqc(PyObject *self, PyObject *args);
+static PyObject *_inP07ytNdUp(PyObject *self, PyObject *args);
+static PyObject *_inP07ytlS0p(PyObject *self, PyObject *args);
+static PyObject *_inP07ytZZe7(PyObject *self, PyObject *args);
+static PyObject *_inP07ytV5S_(PyObject *self, PyObject *args);
+static PyObject *_inP07yto9vD(PyObject *self, PyObject *args);
+static PyObject *_inP07ytv7tF(PyObject *self, PyObject *args);
+static PyObject *_inP07ythOg6(PyObject *self, PyObject *args);
+static PyObject *_inP07ytoZUn(PyObject *self, PyObject *args);
 static PyObject *_inP07ytq45U(PyObject *self, PyObject *args);
 static PyObject *_inP07yt6IPa(PyObject *self, PyObject *args);
 static PyObject *_inP07ytU2_B(PyObject *self, PyObject *args);
@@ -74,7 +85,11 @@ static PyObject *_inP07yt3zru(PyObject *self, PyObject *args);
 static PyObject *_inP07ytRrg2(PyObject *self, PyObject *args);
 static PyObject *_inP07ytEJCx(PyObject *self, PyObject *args);
 static PyObject *_inP07ytWAZr(PyObject *self, PyObject *args);
+static PyObject *_inP07ytHQi6(PyObject *self, PyObject *args);
 static PyObject *_inP07ytrD_M(PyObject *self, PyObject *args);
+static PyObject *_inP07ytYaah(PyObject *self, PyObject *args);
+static PyObject *_inP07yt2otr(PyObject *self, PyObject *args);
+static PyObject *_inP07ytNP_b(PyObject *self, PyObject *args);
 static PyObject *_inP07ytjolz(PyObject *self, PyObject *args);
 static PyObject *_inP07ytt_JD(PyObject *self, PyObject *args);
 static PyObject *_inP07ytwEts(PyObject *self, PyObject *args);
@@ -583,6 +598,184 @@ _inP07ytH5qp(PyObject *, PyObject *args) {
   return nullptr;
 }
 
+/*
+ * Python simple wrapper for
+ * bool interrogate_element_has_has_function(ElementIndex element)
+ */
+static PyObject *
+_inP07ytLfJw(PyObject *, PyObject *args) {
+  int param0;
+  if (PyArg_ParseTuple(args, "i", &param0)) {
+    bool return_value = (::interrogate_element_has_has_function)((ElementIndex)param0);
+    return PyBool_FromLong(return_value);
+  }
+  return nullptr;
+}
+
+/*
+ * Python simple wrapper for
+ * FunctionIndex interrogate_element_has_function(ElementIndex element)
+ */
+static PyObject *
+_inP07yt_Atg(PyObject *, PyObject *args) {
+  int param0;
+  if (PyArg_ParseTuple(args, "i", &param0)) {
+    FunctionIndex return_value = (::interrogate_element_has_function)((ElementIndex)param0);
+#if PY_MAJOR_VERSION >= 3
+    return PyLong_FromLong(return_value);
+#else
+    return PyInt_FromLong(return_value);
+#endif
+  }
+  return nullptr;
+}
+
+/*
+ * Python simple wrapper for
+ * bool interrogate_element_has_clear_function(ElementIndex element)
+ */
+static PyObject *
+_inP07ytlBqc(PyObject *, PyObject *args) {
+  int param0;
+  if (PyArg_ParseTuple(args, "i", &param0)) {
+    bool return_value = (::interrogate_element_has_clear_function)((ElementIndex)param0);
+    return PyBool_FromLong(return_value);
+  }
+  return nullptr;
+}
+
+/*
+ * Python simple wrapper for
+ * FunctionIndex interrogate_element_clear_function(ElementIndex element)
+ */
+static PyObject *
+_inP07ytNdUp(PyObject *, PyObject *args) {
+  int param0;
+  if (PyArg_ParseTuple(args, "i", &param0)) {
+    FunctionIndex return_value = (::interrogate_element_clear_function)((ElementIndex)param0);
+#if PY_MAJOR_VERSION >= 3
+    return PyLong_FromLong(return_value);
+#else
+    return PyInt_FromLong(return_value);
+#endif
+  }
+  return nullptr;
+}
+
+/*
+ * Python simple wrapper for
+ * bool interrogate_element_has_del_function(ElementIndex element)
+ */
+static PyObject *
+_inP07ytlS0p(PyObject *, PyObject *args) {
+  int param0;
+  if (PyArg_ParseTuple(args, "i", &param0)) {
+    bool return_value = (::interrogate_element_has_del_function)((ElementIndex)param0);
+    return PyBool_FromLong(return_value);
+  }
+  return nullptr;
+}
+
+/*
+ * Python simple wrapper for
+ * FunctionIndex interrogate_element_del_function(ElementIndex element)
+ */
+static PyObject *
+_inP07ytZZe7(PyObject *, PyObject *args) {
+  int param0;
+  if (PyArg_ParseTuple(args, "i", &param0)) {
+    FunctionIndex return_value = (::interrogate_element_del_function)((ElementIndex)param0);
+#if PY_MAJOR_VERSION >= 3
+    return PyLong_FromLong(return_value);
+#else
+    return PyInt_FromLong(return_value);
+#endif
+  }
+  return nullptr;
+}
+
+/*
+ * Python simple wrapper for
+ * bool interrogate_element_has_insert_function(ElementIndex element)
+ */
+static PyObject *
+_inP07ytV5S_(PyObject *, PyObject *args) {
+  int param0;
+  if (PyArg_ParseTuple(args, "i", &param0)) {
+    bool return_value = (::interrogate_element_has_insert_function)((ElementIndex)param0);
+    return PyBool_FromLong(return_value);
+  }
+  return nullptr;
+}
+
+/*
+ * Python simple wrapper for
+ * FunctionIndex interrogate_element_insert_function(ElementIndex element)
+ */
+static PyObject *
+_inP07yto9vD(PyObject *, PyObject *args) {
+  int param0;
+  if (PyArg_ParseTuple(args, "i", &param0)) {
+    FunctionIndex return_value = (::interrogate_element_insert_function)((ElementIndex)param0);
+#if PY_MAJOR_VERSION >= 3
+    return PyLong_FromLong(return_value);
+#else
+    return PyInt_FromLong(return_value);
+#endif
+  }
+  return nullptr;
+}
+
+/*
+ * Python simple wrapper for
+ * bool interrogate_element_has_getkey_function(ElementIndex element)
+ */
+static PyObject *
+_inP07ytv7tF(PyObject *, PyObject *args) {
+  int param0;
+  if (PyArg_ParseTuple(args, "i", &param0)) {
+    bool return_value = (::interrogate_element_has_getkey_function)((ElementIndex)param0);
+    return PyBool_FromLong(return_value);
+  }
+  return nullptr;
+}
+
+/*
+ * Python simple wrapper for
+ * FunctionIndex interrogate_element_getkey_function(ElementIndex element)
+ */
+static PyObject *
+_inP07ythOg6(PyObject *, PyObject *args) {
+  int param0;
+  if (PyArg_ParseTuple(args, "i", &param0)) {
+    FunctionIndex return_value = (::interrogate_element_getkey_function)((ElementIndex)param0);
+#if PY_MAJOR_VERSION >= 3
+    return PyLong_FromLong(return_value);
+#else
+    return PyInt_FromLong(return_value);
+#endif
+  }
+  return nullptr;
+}
+
+/*
+ * Python simple wrapper for
+ * FunctionIndex interrogate_element_length_function(ElementIndex element)
+ */
+static PyObject *
+_inP07ytoZUn(PyObject *, PyObject *args) {
+  int param0;
+  if (PyArg_ParseTuple(args, "i", &param0)) {
+    FunctionIndex return_value = (::interrogate_element_length_function)((ElementIndex)param0);
+#if PY_MAJOR_VERSION >= 3
+    return PyLong_FromLong(return_value);
+#else
+    return PyInt_FromLong(return_value);
+#endif
+  }
+  return nullptr;
+}
+
 /*
  * Python simple wrapper for
  * bool interrogate_element_is_sequence(ElementIndex element)
@@ -1060,6 +1253,24 @@ _inP07ytWAZr(PyObject *, PyObject *args) {
   return nullptr;
 }
 
+/*
+ * Python simple wrapper for
+ * FunctionIndex interrogate_wrapper_function(FunctionWrapperIndex wrapper)
+ */
+static PyObject *
+_inP07ytHQi6(PyObject *, PyObject *args) {
+  int param0;
+  if (PyArg_ParseTuple(args, "i", &param0)) {
+    FunctionIndex return_value = (::interrogate_wrapper_function)((FunctionWrapperIndex)param0);
+#if PY_MAJOR_VERSION >= 3
+    return PyLong_FromLong(return_value);
+#else
+    return PyInt_FromLong(return_value);
+#endif
+  }
+  return nullptr;
+}
+
 /*
  * Python simple wrapper for
  * bool interrogate_wrapper_is_callable_by_name(FunctionWrapperIndex wrapper)
@@ -1074,6 +1285,48 @@ _inP07ytrD_M(PyObject *, PyObject *args) {
   return nullptr;
 }
 
+/*
+ * Python simple wrapper for
+ * bool interrogate_wrapper_is_copy_constructor(FunctionWrapperIndex wrapper)
+ */
+static PyObject *
+_inP07ytYaah(PyObject *, PyObject *args) {
+  int param0;
+  if (PyArg_ParseTuple(args, "i", &param0)) {
+    bool return_value = (::interrogate_wrapper_is_copy_constructor)((FunctionWrapperIndex)param0);
+    return PyBool_FromLong(return_value);
+  }
+  return nullptr;
+}
+
+/*
+ * Python simple wrapper for
+ * bool interrogate_wrapper_is_coerce_constructor(FunctionWrapperIndex wrapper)
+ */
+static PyObject *
+_inP07yt2otr(PyObject *, PyObject *args) {
+  int param0;
+  if (PyArg_ParseTuple(args, "i", &param0)) {
+    bool return_value = (::interrogate_wrapper_is_coerce_constructor)((FunctionWrapperIndex)param0);
+    return PyBool_FromLong(return_value);
+  }
+  return nullptr;
+}
+
+/*
+ * Python simple wrapper for
+ * bool interrogate_wrapper_is_extension(FunctionWrapperIndex wrapper)
+ */
+static PyObject *
+_inP07ytNP_b(PyObject *, PyObject *args) {
+  int param0;
+  if (PyArg_ParseTuple(args, "i", &param0)) {
+    bool return_value = (::interrogate_wrapper_is_extension)((FunctionWrapperIndex)param0);
+    return PyBool_FromLong(return_value);
+  }
+  return nullptr;
+}
+
 /*
  * Python simple wrapper for
  * bool interrogate_wrapper_has_comment(FunctionWrapperIndex wrapper)
@@ -2652,6 +2905,17 @@ static PyMethodDef python_simple_funcs[] = {
   { "interrogate_element_getter", &_inP07ytHuAm, METH_VARARGS, nullptr },
   { "interrogate_element_has_setter", &_inP07yt_xr0, METH_VARARGS, nullptr },
   { "interrogate_element_setter", &_inP07ytH5qp, METH_VARARGS, nullptr },
+  { "interrogate_element_has_has_function", &_inP07ytLfJw, METH_VARARGS, nullptr },
+  { "interrogate_element_has_function", &_inP07yt_Atg, METH_VARARGS, nullptr },
+  { "interrogate_element_has_clear_function", &_inP07ytlBqc, METH_VARARGS, nullptr },
+  { "interrogate_element_clear_function", &_inP07ytNdUp, METH_VARARGS, nullptr },
+  { "interrogate_element_has_del_function", &_inP07ytlS0p, METH_VARARGS, nullptr },
+  { "interrogate_element_del_function", &_inP07ytZZe7, METH_VARARGS, nullptr },
+  { "interrogate_element_has_insert_function", &_inP07ytV5S_, METH_VARARGS, nullptr },
+  { "interrogate_element_insert_function", &_inP07yto9vD, METH_VARARGS, nullptr },
+  { "interrogate_element_has_getkey_function", &_inP07ytv7tF, METH_VARARGS, nullptr },
+  { "interrogate_element_getkey_function", &_inP07ythOg6, METH_VARARGS, nullptr },
+  { "interrogate_element_length_function", &_inP07ytoZUn, METH_VARARGS, nullptr },
   { "interrogate_element_is_sequence", &_inP07ytq45U, METH_VARARGS, nullptr },
   { "interrogate_element_is_mapping", &_inP07yt6IPa, METH_VARARGS, nullptr },
   { "interrogate_number_of_globals", &_inP07ytU2_B, METH_VARARGS, nullptr },
@@ -2681,7 +2945,11 @@ static PyMethodDef python_simple_funcs[] = {
   { "interrogate_function_number_of_python_wrappers", &_inP07ytRrg2, METH_VARARGS, nullptr },
   { "interrogate_function_python_wrapper", &_inP07ytEJCx, METH_VARARGS, nullptr },
   { "interrogate_wrapper_name", &_inP07ytWAZr, METH_VARARGS, nullptr },
+  { "interrogate_wrapper_function", &_inP07ytHQi6, METH_VARARGS, nullptr },
   { "interrogate_wrapper_is_callable_by_name", &_inP07ytrD_M, METH_VARARGS, nullptr },
+  { "interrogate_wrapper_is_copy_constructor", &_inP07ytYaah, METH_VARARGS, nullptr },
+  { "interrogate_wrapper_is_coerce_constructor", &_inP07yt2otr, METH_VARARGS, nullptr },
+  { "interrogate_wrapper_is_extension", &_inP07ytNP_b, METH_VARARGS, nullptr },
   { "interrogate_wrapper_has_comment", &_inP07ytjolz, METH_VARARGS, nullptr },
   { "interrogate_wrapper_comment", &_inP07ytt_JD, METH_VARARGS, nullptr },
   { "interrogate_wrapper_has_return_value", &_inP07ytwEts, METH_VARARGS, nullptr },
diff --git a/dtool/src/interrogate/functionRemap.cxx b/dtool/src/interrogate/functionRemap.cxx
index 2f777f84eb..597bda5d59 100644
--- a/dtool/src/interrogate/functionRemap.cxx
+++ b/dtool/src/interrogate/functionRemap.cxx
@@ -312,6 +312,18 @@ make_wrapper_entry(FunctionIndex function_index) {
     iwrapper._flags |= InterrogateFunctionWrapper::F_callable_by_name;
   }
 
+  if (_flags & F_copy_constructor) {
+    iwrapper._flags |= InterrogateFunctionWrapper::F_copy_constructor;
+  }
+
+  if (_flags & F_coerce_constructor) {
+    iwrapper._flags |= InterrogateFunctionWrapper::F_coerce_constructor;
+  }
+
+  if (_extension) {
+    iwrapper._flags |= InterrogateFunctionWrapper::F_extension;
+  }
+
   Parameters::const_iterator pi;
   for (pi = _parameters.begin();
        pi != _parameters.end();
diff --git a/dtool/src/interrogate/interrogate.cxx b/dtool/src/interrogate/interrogate.cxx
index 0c15cb4a3a..0c515ac662 100644
--- a/dtool/src/interrogate/interrogate.cxx
+++ b/dtool/src/interrogate/interrogate.cxx
@@ -417,8 +417,8 @@ main(int argc, char **argv) {
       break;
 
     case CO_python_native:
-        build_python_native = true;
-        break;
+      build_python_native = true;
+      break;
 
     case CO_track_interpreter:
       track_interpreter = true;
@@ -604,23 +604,22 @@ main(int argc, char **argv) {
       << " *\n"
       << " */\n\n";
 
-    if(the_output_include != nullptr)
-    {
-        output_code << "#include \""<<output_include_filename<<"\"\n";
-        *the_output_include << "#include \"" << output_include_filename.get_fullpath_wo_extension() << "_pynative.h\"\n";
+    if (the_output_include != nullptr) {
+      output_code << "#include \"" << output_include_filename << "\"\n";
+      *the_output_include << "#include \"" << output_include_filename.get_fullpath_wo_extension() << "_pynative.h\"\n";
     }
 
     if (output_code.fail()) {
       nout << "Unable to write to " << output_code_filename << "\n";
       status = -1;
     } else {
-      builder.write_code(output_code,the_output_include, def);
+      builder.write_code(output_code, the_output_include, def);
     }
   }
 
-
-  if(the_output_include != nullptr)
-      *the_output_include << "#endif  // #define   " << output_include_filename.get_basename_wo_extension() << "__HH__\n";
+  if (the_output_include != nullptr) {
+    *the_output_include << "#endif  // #define   " << output_include_filename.get_basename_wo_extension() << "__HH__\n";
+  }
 
   // And now output the bulk of the database.
   if (!output_data_filename.empty()) {
diff --git a/dtool/src/interrogatedb/interrogateFunctionWrapper.I b/dtool/src/interrogatedb/interrogateFunctionWrapper.I
index b0ec398623..111eba10c1 100644
--- a/dtool/src/interrogatedb/interrogateFunctionWrapper.I
+++ b/dtool/src/interrogatedb/interrogateFunctionWrapper.I
@@ -63,6 +63,30 @@ is_callable_by_name() const {
   return (_flags & F_callable_by_name) != 0;
 }
 
+/**
+ * @since 1.10.13
+ */
+INLINE bool InterrogateFunctionWrapper::
+is_copy_constructor() const {
+  return (_flags & F_copy_constructor) != 0;
+}
+
+/**
+ * @since 1.10.13
+ */
+INLINE bool InterrogateFunctionWrapper::
+is_coerce_constructor() const {
+  return (_flags & F_coerce_constructor) != 0;
+}
+
+/**
+ * @since 1.10.13
+ */
+INLINE bool InterrogateFunctionWrapper::
+is_extension() const {
+  return (_flags & F_extension) != 0;
+}
+
 /**
  *
  */
diff --git a/dtool/src/interrogatedb/interrogateFunctionWrapper.h b/dtool/src/interrogatedb/interrogateFunctionWrapper.h
index 29e59ed259..6c41a46cab 100644
--- a/dtool/src/interrogatedb/interrogateFunctionWrapper.h
+++ b/dtool/src/interrogatedb/interrogateFunctionWrapper.h
@@ -34,6 +34,9 @@ public:
   INLINE FunctionIndex get_function() const;
 
   INLINE bool is_callable_by_name() const;
+  INLINE bool is_copy_constructor() const;
+  INLINE bool is_coerce_constructor() const;
+  INLINE bool is_extension() const;
 
   INLINE bool has_return_value() const;
   INLINE TypeIndex get_return_type() const;
@@ -61,7 +64,10 @@ private:
   enum Flags {
     F_caller_manages   = 0x0001,
     F_has_return       = 0x0002,
-    F_callable_by_name = 0x0004
+    F_callable_by_name = 0x0004,
+    F_copy_constructor = 0x0008,
+    F_coerce_constructor = 0x0010,
+    F_extension        = 0x0020,
   };
 
   enum ParameterFlags {
diff --git a/dtool/src/interrogatedb/interrogate_interface.cxx b/dtool/src/interrogatedb/interrogate_interface.cxx
index d7f4ce58dd..e4dbef1a76 100644
--- a/dtool/src/interrogatedb/interrogate_interface.cxx
+++ b/dtool/src/interrogatedb/interrogate_interface.cxx
@@ -176,6 +176,72 @@ interrogate_element_setter(ElementIndex element) {
   return InterrogateDatabase::get_ptr()->get_element(element).get_setter();
 }
 
+bool
+interrogate_element_has_has_function(ElementIndex element) {
+  // cerr << "interrogate_element_has_has_function(" << element << ")\n";
+  return InterrogateDatabase::get_ptr()->get_element(element).has_has_function();
+}
+
+FunctionIndex
+interrogate_element_has_function(ElementIndex element) {
+  // cerr << "interrogate_element_has_function(" << element << ")\n";
+  return InterrogateDatabase::get_ptr()->get_element(element).get_has_function();
+}
+
+bool
+interrogate_element_has_clear_function(ElementIndex element) {
+  // cerr << "interrogate_element_has_clear_function(" << element << ")\n";
+  return InterrogateDatabase::get_ptr()->get_element(element).has_clear_function();
+}
+
+FunctionIndex
+interrogate_element_clear_function(ElementIndex element) {
+  // cerr << "interrogate_element_clear_function(" << element << ")\n";
+  return InterrogateDatabase::get_ptr()->get_element(element).get_clear_function();
+}
+
+bool
+interrogate_element_has_del_function(ElementIndex element) {
+  // cerr << "interrogate_element_has_del_function(" << element << ")\n";
+  return InterrogateDatabase::get_ptr()->get_element(element).has_del_function();
+}
+
+FunctionIndex
+interrogate_element_del_function(ElementIndex element) {
+  // cerr << "interrogate_element_del_function(" << element << ")\n";
+  return InterrogateDatabase::get_ptr()->get_element(element).get_del_function();
+}
+
+bool
+interrogate_element_has_insert_function(ElementIndex element) {
+  // cerr << "interrogate_element_has_insert_function(" << element << ")\n";
+  return InterrogateDatabase::get_ptr()->get_element(element).has_insert_function();
+}
+
+FunctionIndex
+interrogate_element_insert_function(ElementIndex element) {
+  // cerr << "interrogate_element_insert_function(" << element << ")\n";
+  return InterrogateDatabase::get_ptr()->get_element(element).get_insert_function();
+}
+
+bool
+interrogate_element_has_getkey_function(ElementIndex element) {
+  // cerr << "interrogate_element_has_getkey_function(" << element << ")\n";
+  return InterrogateDatabase::get_ptr()->get_element(element).has_getkey_function();
+}
+
+FunctionIndex
+interrogate_element_getkey_function(ElementIndex element) {
+  // cerr << "interrogate_element_getkey_function(" << element << ")\n";
+  return InterrogateDatabase::get_ptr()->get_element(element).get_getkey_function();
+}
+
+FunctionIndex
+interrogate_element_length_function(ElementIndex element) {
+  // cerr << "interrogate_element_length_function(" << element << ")\n";
+  return InterrogateDatabase::get_ptr()->get_element(element).get_length_function();
+}
+
 bool
 interrogate_element_is_sequence(ElementIndex element) {
   // cerr << "interrogate_element_is_sequence(" << element << ")\n";
@@ -359,12 +425,36 @@ interrogate_wrapper_name(FunctionWrapperIndex wrapper) {
   return result.c_str();
 }
 
+FunctionIndex
+interrogate_wrapper_function(FunctionWrapperIndex wrapper) {
+  // cerr << "interrogate_wrapper_function(" << wrapper << ")\n";
+  return InterrogateDatabase::get_ptr()->get_wrapper(wrapper).get_function();
+}
+
 bool
 interrogate_wrapper_is_callable_by_name(FunctionWrapperIndex wrapper) {
   // cerr << "interrogate_wrapper_is_callable_by_name(" << wrapper << ")\n";
   return InterrogateDatabase::get_ptr()->get_wrapper(wrapper).is_callable_by_name();
 }
 
+bool
+interrogate_wrapper_is_copy_constructor(FunctionWrapperIndex wrapper) {
+  // cerr << "interrogate_wrapper_is_copy_constructor(" << wrapper << ")\n";
+  return InterrogateDatabase::get_ptr()->get_wrapper(wrapper).is_copy_constructor();
+}
+
+bool
+interrogate_wrapper_is_coerce_constructor(FunctionWrapperIndex wrapper) {
+  // cerr << "interrogate_wrapper_is_coerce_constructor(" << wrapper << ")\n";
+  return InterrogateDatabase::get_ptr()->get_wrapper(wrapper).is_coerce_constructor();
+}
+
+bool
+interrogate_wrapper_is_extension(FunctionWrapperIndex wrapper) {
+  // cerr << "interrogate_wrapper_is_extension(" << wrapper << ")\n";
+  return InterrogateDatabase::get_ptr()->get_wrapper(wrapper).is_extension();
+}
+
 bool
 interrogate_wrapper_has_comment(FunctionWrapperIndex wrapper) {
   // cerr << "interrogate_wrapper_has_comment(" << wrapper << ")\n";
diff --git a/dtool/src/interrogatedb/interrogate_interface.h b/dtool/src/interrogatedb/interrogate_interface.h
index a44f9fef92..5c776e70eb 100644
--- a/dtool/src/interrogatedb/interrogate_interface.h
+++ b/dtool/src/interrogatedb/interrogate_interface.h
@@ -152,6 +152,17 @@ EXPCL_INTERROGATEDB bool interrogate_element_has_getter(ElementIndex element);
 EXPCL_INTERROGATEDB FunctionIndex interrogate_element_getter(ElementIndex element);
 EXPCL_INTERROGATEDB bool interrogate_element_has_setter(ElementIndex element);
 EXPCL_INTERROGATEDB FunctionIndex interrogate_element_setter(ElementIndex element);
+EXPCL_INTERROGATEDB bool interrogate_element_has_has_function(ElementIndex element);
+EXPCL_INTERROGATEDB FunctionIndex interrogate_element_has_function(ElementIndex element);
+EXPCL_INTERROGATEDB bool interrogate_element_has_clear_function(ElementIndex element);
+EXPCL_INTERROGATEDB FunctionIndex interrogate_element_clear_function(ElementIndex element);
+EXPCL_INTERROGATEDB bool interrogate_element_has_del_function(ElementIndex element);
+EXPCL_INTERROGATEDB FunctionIndex interrogate_element_del_function(ElementIndex element);
+EXPCL_INTERROGATEDB bool interrogate_element_has_insert_function(ElementIndex element);
+EXPCL_INTERROGATEDB FunctionIndex interrogate_element_insert_function(ElementIndex element);
+EXPCL_INTERROGATEDB bool interrogate_element_has_getkey_function(ElementIndex element);
+EXPCL_INTERROGATEDB FunctionIndex interrogate_element_getkey_function(ElementIndex element);
+EXPCL_INTERROGATEDB FunctionIndex interrogate_element_length_function(ElementIndex element);
 
 EXPCL_INTERROGATEDB bool interrogate_element_is_sequence(ElementIndex element);
 EXPCL_INTERROGATEDB bool interrogate_element_is_mapping(ElementIndex element);
@@ -261,10 +272,23 @@ EXPCL_INTERROGATEDB FunctionWrapperIndex interrogate_function_python_wrapper(Fun
 // not identical.
 EXPCL_INTERROGATEDB const char *interrogate_wrapper_name(FunctionWrapperIndex wrapper);
 
+// Returns the function that this wrapper belongs to.
+EXPCL_INTERROGATEDB FunctionIndex interrogate_wrapper_function(FunctionWrapperIndex wrapper);
+
 // This returns true if -fnames was given to interrogate, making the wrapper
 // function callable directly by its name.
 EXPCL_INTERROGATEDB bool interrogate_wrapper_is_callable_by_name(FunctionWrapperIndex wrapper);
 
+// This returns true if this is a copy constructor.
+EXPCL_INTERROGATEDB bool interrogate_wrapper_is_copy_constructor(FunctionWrapperIndex wrapper);
+
+// This returns true if this is a constructor that is not marked "explicit".
+EXPCL_INTERROGATEDB bool interrogate_wrapper_is_coerce_constructor(FunctionWrapperIndex wrapper);
+
+// This returns true if this is an extension function, rather than a real
+// function defined in the C++ code.
+EXPCL_INTERROGATEDB bool interrogate_wrapper_is_extension(FunctionWrapperIndex wrapper);
+
 // This returns the C++ comment written for the function wrapper, usually from
 // the .cpp file.  There may be a different comment for each overload of a
 // given function.
diff --git a/makepanda/makepanda.py b/makepanda/makepanda.py
index ea512dd87f..fe2e0f455a 100755
--- a/makepanda/makepanda.py
+++ b/makepanda/makepanda.py
@@ -2373,7 +2373,7 @@ DTOOL_CONFIG=[
     ("HAVE_PROC_SELF_CMDLINE",         'UNDEF',                  '1'),
     ("HAVE_PROC_CURPROC_FILE",         'UNDEF',                  'UNDEF'),
     ("HAVE_PROC_CURPROC_MAP",          'UNDEF',                  'UNDEF'),
-    ("HAVE_PROC_SELF_CMDLINE",         'UNDEF',                  'UNDEF'),
+    ("HAVE_PROC_CURPROC_CMDLINE",      'UNDEF',                  'UNDEF'),
     ("HAVE_GLOBAL_ARGV",               '1',                      'UNDEF'),
     ("PROTOTYPE_GLOBAL_ARGV",          'UNDEF',                  'UNDEF'),
     ("GLOBAL_ARGV",                    '__argv',                 'UNDEF'),
@@ -3302,6 +3302,7 @@ if not PkgSkip("DIRECT"):
     CopyAllHeaders('direct/src/distributed')
     CopyAllHeaders('direct/src/interval')
     CopyAllHeaders('direct/src/showbase')
+    CopyAllHeaders('direct/src/motiontrail')
     CopyAllHeaders('direct/src/dcparse')
 
 if not PkgSkip("PANDATOOL"):
diff --git a/panda/src/collide/collisionPolygon.cxx b/panda/src/collide/collisionPolygon.cxx
index f44f0e2e77..51f9ffc0ea 100644
--- a/panda/src/collide/collisionPolygon.cxx
+++ b/panda/src/collide/collisionPolygon.cxx
@@ -787,6 +787,200 @@ test_intersection_from_segment(const CollisionEntry &entry) const {
   return new_entry;
 }
 
+/**
+ *
+ */
+PT(CollisionEntry) CollisionPolygon::
+test_intersection_from_capsule(const CollisionEntry &entry) const {
+  const CollisionCapsule *capsule;
+  DCAST_INTO_R(capsule, entry.get_from(), nullptr);
+
+  const LMatrix4 &wrt_mat = entry.get_wrt_mat();
+
+  LPoint3 from_a = capsule->get_point_a() * wrt_mat;
+  LPoint3 from_b = capsule->get_point_b() * wrt_mat;
+  LVector3 from_radius_v =
+    LVector3(capsule->get_radius(), 0.0f, 0.0f) * wrt_mat;
+  PN_stdfloat from_radius_2 = from_radius_v.length_squared();
+  PN_stdfloat from_radius = csqrt(from_radius_2);
+
+  PN_stdfloat dist_a = get_plane().dist_to_plane(from_a);
+  PN_stdfloat dist_b = get_plane().dist_to_plane(from_b);
+
+  // Some early-outs (optional)
+  if (dist_a >= from_radius && dist_b >= from_radius) {
+    // Entirely in front of the plane means no intersection.
+    return nullptr;
+  }
+
+  if (dist_a <= -from_radius && dist_b <= -from_radius) {
+    // Entirely behind the plane also means no intersection.
+    return nullptr;
+  }
+
+  LMatrix4 to_3d_mat;
+  rederive_to_3d_mat(to_3d_mat);
+
+  // Find the intersection point between the capsule's axis and the plane.
+  LPoint3 intersect_3d;
+  if (!get_plane().intersects_line(intersect_3d, from_a, from_b)) {
+    // Completely parallel.  Take an arbitrary point along the capsule axis.
+    intersect_3d = (from_a + from_b) * 0.5f;
+  }
+
+  // Find the closest point on the polygon to this intersection point.
+  LPoint2 intersect_2d = to_2d(intersect_3d);
+  LPoint2 closest_p_2d = intersect_2d;
+  PN_stdfloat best_dist_2 = -1;
+
+  size_t num_points = _points.size();
+  for (size_t i = 0; i < num_points; ++i) {
+    const LPoint2 &p1 = _points[i]._p;
+    const LPoint2 &p2 = _points[(i + 1) % num_points]._p;
+
+    // Is the intersection outside the polygon?
+    LVector2 v = intersect_2d - p1;
+    LVector2 pv = p2 - p1;
+    if (is_right(v, pv)) {
+      PN_stdfloat t = v.dot(pv) / pv.length_squared();
+      t = max(min(t, (PN_stdfloat)1), (PN_stdfloat)0);
+
+      LPoint2 p = p1 + pv * t;
+      PN_stdfloat d = (p - intersect_2d).length_squared();
+      if (best_dist_2 < 0 || d < best_dist_2) {
+        closest_p_2d = p;
+        best_dist_2 = d;
+      }
+    }
+  }
+
+  LPoint3 closest_p_3d = to_3d(closest_p_2d, to_3d_mat);
+
+  // Now find the closest point on the capsule axis to this point.
+  LVector3 from_v = from_b - from_a;
+
+  PN_stdfloat t = (closest_p_3d - from_a).dot(from_v) / from_v.length_squared();
+  LPoint3 ref_point_3d = from_a + from_v * max(min(t, (PN_stdfloat)1), (PN_stdfloat)0);
+
+  // Okay, now we have a point to apply the sphere test on.
+
+  // The nearest point within the plane to our reference is the intersection of
+  // the line (reference, reference - normal) with the plane.
+  PN_stdfloat dist;
+  if (!get_plane().intersects_line(dist, ref_point_3d, -get_normal())) {
+    // No intersection with plane?  This means the plane's effective normal
+    // was within the plane itself.  A useless polygon.
+    return nullptr;
+  }
+
+  if (dist > from_radius || dist < -from_radius) {
+    // No intersection with the plane.
+    return nullptr;
+  }
+
+  LPoint2 ref_point_2d = to_2d(ref_point_3d);
+  LPoint2 surface_point_2d = ref_point_2d;
+  PN_stdfloat edge_dist_2 = -1;
+
+  for (size_t i = 0; i < num_points; ++i) {
+    const LPoint2 &p1 = _points[i]._p;
+    const LPoint2 &p2 = _points[(i + 1) % num_points]._p;
+
+    // Is the intersection outside the polygon?
+    LVector2 v = ref_point_2d - p1;
+    LVector2 pv = p2 - p1;
+    if (is_right(v, pv)) {
+      PN_stdfloat t = v.dot(pv) / pv.length_squared();
+      t = max(min(t, (PN_stdfloat)1), (PN_stdfloat)0);
+
+      LPoint2 p = p1 + pv * t;
+      PN_stdfloat d = (p - ref_point_2d).length_squared();
+      if (edge_dist_2 < 0 || d < edge_dist_2) {
+        surface_point_2d = p;
+        edge_dist_2 = d;
+      }
+    }
+  }
+
+  // Now we have edge_dist_2, which is the square of the distance from the
+  // reference point to the nearest edge of the polygon, within the polygon's
+  // plane.
+
+  if (edge_dist_2 > from_radius_2) {
+    // No intersection; the circle is outside the polygon.
+    return nullptr;
+  }
+
+  // The sphere appears to intersect the polygon.  If the edge is less than
+  // from_radius away, the sphere may be resting on an edge of the polygon.
+  // Determine how far the center of the sphere must remain from the plane,
+  // based on its distance from the nearest edge.
+
+  PN_stdfloat max_dist = from_radius;
+  if (edge_dist_2 >= 0.0f) {
+    PN_stdfloat max_dist_2 = max(from_radius_2 - edge_dist_2, (PN_stdfloat)0.0);
+    max_dist = csqrt(max_dist_2);
+  }
+
+  if (dist > max_dist || -dist > max_dist) {
+    // There's no intersection: the sphere is hanging above or under the edge.
+    return nullptr;
+  }
+
+  if (collide_cat.is_debug()) {
+    collide_cat.debug()
+      << "intersection detected from " << entry.get_from_node_path()
+      << " into " << entry.get_into_node_path() << "\n";
+  }
+  PT(CollisionEntry) new_entry = new CollisionEntry(entry);
+
+  LVector3 normal = (has_effective_normal() && capsule->get_respect_effective_normal()) ? get_effective_normal() : get_normal();
+  new_entry->set_surface_normal(normal);
+
+  if ((dist_a < 0 || dist_b < 0) && !IS_NEARLY_EQUAL(dist_a, dist_b)) {
+    // We need to report the deepest point below the polygon as the interior
+    // point so that the pusher will completely push it out.
+    LPoint3 deepest_3d = (dist_a < dist_b) ? from_a : from_b;
+    LPoint2 deepest_2d = to_2d(deepest_3d);
+    surface_point_2d = deepest_2d;
+    PN_stdfloat best_dist_2 = -1;
+
+    for (size_t i = 0; i < num_points; ++i) {
+      const LPoint2 &p1 = _points[i]._p;
+      const LPoint2 &p2 = _points[(i + 1) % num_points]._p;
+
+      // Is the deepest point outside the polygon?
+      LVector2 v = deepest_2d - p1;
+      LVector2 pv = p2 - p1;
+      if (is_right(v, pv)) {
+        PN_stdfloat t = v.dot(pv) / pv.length_squared();
+        t = max(min(t, (PN_stdfloat)1), (PN_stdfloat)0);
+
+        LPoint2 p = p1 + pv * t;
+        PN_stdfloat d = (p - deepest_2d).length_squared();
+        if (best_dist_2 < 0 || d < best_dist_2) {
+          surface_point_2d = p;
+          best_dist_2 = d;
+        }
+      }
+    }
+
+    if (best_dist_2 < 0) {
+      // Deepest point is completely within the polygon, easy case.
+      new_entry->set_surface_point(deepest_3d - normal * min(dist_a, dist_b));
+      new_entry->set_interior_point(deepest_3d - normal * from_radius);
+      return new_entry;
+    }
+  }
+
+  // Colliding with an edge, use the sphere test results.
+  LPoint3 surface_point = to_3d(surface_point_2d, to_3d_mat);
+  LPoint3 interior_point = ref_point_3d - normal * max_dist;
+  new_entry->set_surface_point(surface_point);
+  new_entry->set_interior_point((interior_point - surface_point).project(normal) + surface_point);
+  return new_entry;
+}
+
 /**
  * This is part of the double-dispatch implementation of test_intersection().
  * It is called when the "from" object is a parabola.
diff --git a/panda/src/collide/collisionPolygon.h b/panda/src/collide/collisionPolygon.h
index cb62afaa2d..95ad322f7d 100644
--- a/panda/src/collide/collisionPolygon.h
+++ b/panda/src/collide/collisionPolygon.h
@@ -96,6 +96,8 @@ protected:
   virtual PT(CollisionEntry)
   test_intersection_from_segment(const CollisionEntry &entry) const;
   virtual PT(CollisionEntry)
+  test_intersection_from_capsule(const CollisionEntry &entry) const;
+  virtual PT(CollisionEntry)
   test_intersection_from_parabola(const CollisionEntry &entry) const;
   virtual PT(CollisionEntry)
   test_intersection_from_capsule(const CollisionEntry &entry) const;
diff --git a/panda/src/egg/eggPrimitive.h b/panda/src/egg/eggPrimitive.h
index 1e280a8175..f5901e25e9 100644
--- a/panda/src/egg/eggPrimitive.h
+++ b/panda/src/egg/eggPrimitive.h
@@ -134,10 +134,9 @@ PUBLISHED:
   virtual bool joint_has_primitives() const;
   virtual bool has_normals() const;
 
-
   // The EggPrimitive itself appears to be an STL container of pointers to
   // EggVertex objects.  The set of vertices is read-only, however, except
-  // through the limited add_vertexremove_vertex or inserterase interface.
+  // through the limited add_vertex/remove_vertex or insert/erase interface.
   // The following implements this.
 public:
 #ifdef _WIN32
@@ -203,8 +202,8 @@ protected:
   Vertices _vertices;
 
   // Don't try to use these private functions.  User code should add and
-  // remove vertices via add_vertex()remove_vertex(), or via the STL-like
-  // push_back()pop_back() or insert()erase(), above.
+  // remove vertices via add_vertex() / remove_vertex(), or via the STL-like
+  // push_back() / pop_back() or insert() / erase(), above.
   virtual void prepare_add_vertex(EggVertex *vertex, int i, int n);
   virtual void prepare_remove_vertex(EggVertex *vertex, int i, int n);
 
diff --git a/panda/src/glstuff/glGraphicsStateGuardian_src.cxx b/panda/src/glstuff/glGraphicsStateGuardian_src.cxx
index c1155efa05..aefb4c2572 100644
--- a/panda/src/glstuff/glGraphicsStateGuardian_src.cxx
+++ b/panda/src/glstuff/glGraphicsStateGuardian_src.cxx
@@ -14935,6 +14935,7 @@ do_extract_texture_data(CLP(TextureContext) *gtc) {
     break;
   case GL_LUMINANCE:
 #ifndef OPENGLES
+  case GL_LUMINANCE8_EXT:
   case GL_LUMINANCE16:
   case GL_LUMINANCE16F_ARB:
 #endif
diff --git a/panda/src/linmath/lmatrix3_src.h b/panda/src/linmath/lmatrix3_src.h
index cf5f7c6776..f46432b1d2 100644
--- a/panda/src/linmath/lmatrix3_src.h
+++ b/panda/src/linmath/lmatrix3_src.h
@@ -90,8 +90,8 @@ PUBLISHED:
   INLINE_LINMATH FLOATNAME(LVecBase3) get_col(int col) const;
   MAKE_SEQ(get_rows, size, get_row);
   MAKE_SEQ(get_cols, size, get_col);
-  MAKE_SEQ_PROPERTY(rows, size, get_row);
-  MAKE_SEQ_PROPERTY(cols, size, get_col);
+  MAKE_SEQ_PROPERTY(rows, size, get_row, set_row);
+  MAKE_SEQ_PROPERTY(cols, size, get_col, set_col);
 
   INLINE_LINMATH FLOATNAME(LVecBase2) get_row2(int row) const;
   INLINE_LINMATH FLOATNAME(LVecBase2) get_col2(int col) const;
diff --git a/panda/src/linmath/lmatrix4_src.h b/panda/src/linmath/lmatrix4_src.h
index 5400f0872b..3609f54d8d 100644
--- a/panda/src/linmath/lmatrix4_src.h
+++ b/panda/src/linmath/lmatrix4_src.h
@@ -105,8 +105,8 @@ PUBLISHED:
   MAKE_SEQ(get_rows, size, get_row);
   MAKE_SEQ(get_cols, size, get_col);
   MAKE_SEQ(get_row3s, size, get_row3);
-  MAKE_SEQ_PROPERTY(rows, size, get_row);
-  MAKE_SEQ_PROPERTY(cols, size, get_col);
+  MAKE_SEQ_PROPERTY(rows, size, get_row, set_row);
+  MAKE_SEQ_PROPERTY(cols, size, get_col, set_col);
 
   // these versions inline better
   INLINE_LINMATH void get_row(FLOATNAME(LVecBase4) &result_vec, int row) const;