@@ -1859,6 +1859,16 @@ Changes in the Python API
   to :c:func:`PyUnstable_Code_GetFirstFree`.
   (Contributed by Bogdan Romanyuk in :gh:`115781`.)
 
+* Callbacks registered in the :mod:`tkinter` module now take arguments as
+  various Python objects (``int``, ``float``, ``bytes``, ``tuple``),
+  not just ``str``.
+  To restore the previous behavior set :mod:`!tkinter` module global
+  :data:`!wantobject` to ``1`` before creating the
+  :class:`!Tk` object or call the :meth:`!wantobject`
+  method of the :class:`!Tk` object with argument ``1``.
+  Calling it with argument ``2`` restores the current default behavior.
+  (Contributed by Serhiy Storchaka in :gh:`66410`.)
+
 
 Build Changes
 =============
 
@@ -106,6 +106,7 @@ def dispatch(self, operation, *args):
         to *args to accomplish that.  For an example, see colorizer.py.
 
         '''
+        operation = str(operation)  # can be a Tcl_Obj
         m = self._operations.get(operation)
         try:
             if m:
 
@@ -482,29 +482,36 @@ def testfunc(arg):
             return arg
         self.interp.createcommand('testfunc', testfunc)
         self.addCleanup(self.interp.tk.deletecommand, 'testfunc')
-        def check(value, expected=None, *, eq=self.assertEqual):
-            if expected is None:
-                expected = value
+        def check(value, expected1=None, expected2=None, *, eq=self.assertEqual):
+            expected = value
+            if self.wantobjects >= 2:
+                if expected2 is not None:
+                    expected = expected2
+                expected_type = type(expected)
+            else:
+                if expected1 is not None:
+                    expected = expected1
+                expected_type = str
             nonlocal result
             result = None
             r = self.interp.call('testfunc', value)
-            self.assertIsInstance(result, str)
+            self.assertIsInstance(result, expected_type)
             eq(result, expected)
-            self.assertIsInstance(r, str)
+            self.assertIsInstance(r, expected_type)
             eq(r, expected)
         def float_eq(actual, expected):
             self.assertAlmostEqual(float(actual), expected,
                                    delta=abs(expected) * 1e-10)
 
-        check(True, '1')
-        check(False, '0')
+        check(True, '1', 1)
+        check(False, '0', 0)
         check('string')
         check('string\xbd')
         check('string\u20ac')
         check('string\U0001f4bb')
         if sys.platform != 'win32':
-            check('<\udce2\udc82\udcac>', '<\u20ac>')
-            check('<\udced\udca0\udcbd\udced\udcb2\udcbb>', '<\U0001f4bb>')
+            check('<\udce2\udc82\udcac>', '<\u20ac>', '<\u20ac>')
+            check('<\udced\udca0\udcbd\udced\udcb2\udcbb>', '<\U0001f4bb>', '<\U0001f4bb>')
         check('')
         check(b'string', 'string')
         check(b'string\xe2\x82\xac', 'string\xe2\x82\xac')
@@ -526,9 +533,13 @@ def float_eq(actual, expected):
         check(float('inf'), eq=float_eq)
         check(-float('inf'), eq=float_eq)
         # XXX NaN representation can be not parsable by float()
-        check((), '')
-        check((1, (2,), (3, 4), '5 6', ()), '1 2 {3 4} {5 6} {}')
-        check([1, [2,], [3, 4], '5 6', []], '1 2 {3 4} {5 6} {}')
+        check((), '', '')
+        check((1, (2,), (3, 4), '5 6', ()),
+              '1 2 {3 4} {5 6} {}',
+              (1, (2,), (3, 4), '5 6', ''))
+        check([1, [2,], [3, 4], '5 6', []],
+              '1 2 {3 4} {5 6} {}',
+              (1, (2,), (3, 4), '5 6', ''))
 
     def test_splitlist(self):
         splitlist = self.interp.tk.splitlist
 
@@ -40,7 +40,7 @@
 from tkinter.constants import *
 import re
 
-wantobjects = 1
+wantobjects = 2
 _debug = False  # set to True to print executed Tcl/Tk commands
 
 TkVersion = float(_tkinter.TK_VERSION)
@@ -1762,7 +1762,10 @@ def getint_event(s):
         try:
             e.type = EventType(T)
         except ValueError:
-            e.type = T
+            try:
+                e.type = EventType(str(T))  # can be int
+            except ValueError:
+                e.type = T
         try:
             e.widget = self._nametowidget(W)
         except KeyError:
 
@@ -0,0 +1,7 @@
+Callbacks registered in the :mod:`tkinter` module now take arguments as
+various Python objects (``int``, ``float``, ``bytes``, ``tuple``), not just
+``str``. To restore the previous behavior set :mod:`!tkinter` module global
+:data:`~tkinter.wantobject` to ``1`` before creating the
+:class:`~tkinter.Tk` object or call the :meth:`~tkinter.Tk.wantobject`
+method of the :class:`!Tk` object with argument ``1``. Calling it with
+argument ``2`` restores the current default behavior.
@@ -2248,7 +2248,7 @@ _tkinter_tkapp_splitlist(TkappObject *self, PyObject *arg)
 
 /* Client data struct */
 typedef struct {
-    PyObject *self;
+    TkappObject *self;
     PyObject *func;
 } PythonCmd_ClientData;
 
@@ -2272,6 +2272,7 @@ PythonCmd(ClientData clientData, Tcl_Interp *interp,
     PyObject *args, *res;
     int i;
     Tcl_Obj *obj_res;
+    int objargs = data->self->wantobjects >= 2;
 
     ENTER_PYTHON
 
@@ -2280,7 +2281,8 @@ PythonCmd(ClientData clientData, Tcl_Interp *interp,
         return PythonCmd_Error(interp);
 
     for (i = 0; i < (objc - 1); i++) {
-        PyObject *s = unicodeFromTclObj(objv[i + 1]);
+        PyObject *s = objargs ? FromObj(data->self, objv[i + 1])
+                              : unicodeFromTclObj(objv[i + 1]);
         if (!s) {
             Py_DECREF(args);
             return PythonCmd_Error(interp);
@@ -2383,7 +2385,8 @@ _tkinter_tkapp_createcommand_impl(TkappObject *self, const char *name,
     data = PyMem_NEW(PythonCmd_ClientData, 1);
     if (!data)
         return PyErr_NoMemory();
-    data->self = Py_NewRef(self);
+    Py_INCREF(self);
+    data->self = self;
     data->func = Py_NewRef(func);
     if (self->threaded && self->thread_id != Tcl_GetCurrentThread()) {
         Tcl_Condition cond = NULL;
@@ -2897,10 +2900,10 @@ Tkapp_WantObjects(PyObject *self, PyObject *args)
 {
 
     int wantobjects = -1;
-    if (!PyArg_ParseTuple(args, "|p:wantobjects", &wantobjects))
+    if (!PyArg_ParseTuple(args, "|i:wantobjects", &wantobjects))
         return NULL;
     if (wantobjects == -1)
-        return PyBool_FromLong(((TkappObject*)self)->wantobjects);
+        return PyLong_FromLong(((TkappObject*)self)->wantobjects);
     ((TkappObject*)self)->wantobjects = wantobjects;
 
     Py_RETURN_NONE;
@@ -3086,7 +3089,7 @@ _tkinter.create
     baseName: str = ""
     className: str = "Tk"
     interactive: bool = False
-    wantobjects: bool = False
+    wantobjects: int = 0
     wantTk: bool = True
         if false, then Tk_Init() doesn't get called
     sync: bool = False
@@ -3102,7 +3105,7 @@ _tkinter_create_impl(PyObject *module, const char *screenName,
                      const char *baseName, const char *className,
                      int interactive, int wantobjects, int wantTk, int sync,
                      const char *use)
-/*[clinic end generated code: output=e3315607648e6bb4 input=09afef9adea70a19]*/
+/*[clinic end generated code: output=e3315607648e6bb4 input=7e382ba431bed537]*/
 {
     /* XXX baseName is not used anymore;
      * try getting rid of it. */