diff --git a/Doc/library/json.rst b/Doc/library/json.rst
index 5e8c452a5ab9a1..ddd12a002f7416 100644
--- a/Doc/library/json.rst
+++ b/Doc/library/json.rst
@@ -261,6 +261,8 @@ Basic Usage
       into JSON and then back into a dictionary, the dictionary may not equal
       the original one. That is, ``loads(dumps(x)) != x`` if x has non-string
       keys.
+      *sort_keys* sorts the keys before they are coerced to strings,
+      so numeric keys are sorted by value, not by their string representation.
 
 .. function:: load(fp, *, cls=None, object_hook=None, parse_float=None, \
                    parse_int=None, parse_constant=None, \
diff --git a/Doc/library/tk.rst b/Doc/library/tk.rst
index e27af48ba7ac48..9ca26a5dfa7659 100644
--- a/Doc/library/tk.rst
+++ b/Doc/library/tk.rst
@@ -34,7 +34,7 @@ alternative `GUI frameworks and tools <https://wiki.python.org/moin/GuiProgrammi
    tkinter.colorchooser.rst
    tkinter.font.rst
    tkinter.fontchooser.rst
-   dialog.rst
+   tkinter.dialogs.rst
    tkinter.messagebox.rst
    tkinter.scrolledtext.rst
    tkinter.systray.rst
diff --git a/Doc/library/dialog.rst b/Doc/library/tkinter.dialogs.rst
similarity index 100%
rename from Doc/library/dialog.rst
rename to Doc/library/tkinter.dialogs.rst
diff --git a/Doc/tools/removed-ids.txt b/Doc/tools/removed-ids.txt
index 20bef00eb891cb..ae116da1456641 100644
--- a/Doc/tools/removed-ids.txt
+++ b/Doc/tools/removed-ids.txt
@@ -82,3 +82,6 @@ reference/expressions.html: generator.__next__
 reference/expressions.html: generator.close
 reference/expressions.html: generator.send
 reference/expressions.html: generator.throw
+
+# Renamed to library/tkinter.dialogs.html
+library/dialog.html: (page missing)
diff --git a/Lib/test/test_csv.py b/Lib/test/test_csv.py
index 73e282d1abf717..36fa7e3572a5ac 100644
--- a/Lib/test/test_csv.py
+++ b/Lib/test/test_csv.py
@@ -227,6 +227,18 @@ def test_write_quoting(self):
                          quoting = csv.QUOTE_STRINGS)
         self._write_test(['a','',None,1], '"a","",,"1"',
                          quoting = csv.QUOTE_NOTNULL)
+        # FULLWIDTH QUOTATION MARK
+        self._write_test(['a', 1, 'p,q', 'r＂s', 'x！y'],
+                         'a,1,＂p,q＂,＂r＂＂s＂,x！y',
+                         quotechar='＂')
+
+    def test_write_delimiter(self):
+        self._write_test(['a', 1, 'p,q', 'x;y'], 'a,1,"p,q",x;y')
+        self._write_test(['a', 1, 'p;q', 'x,y'], 'a;1;"p;q";x,y', delimiter=';')
+        self._write_test(['a', 1, 'p\0q', 'x,y'], 'a\x001\0"p\0q"\0x,y',
+                         delimiter='\0')
+        self._write_test(['a', 1, 'p🍌q', 'x🍍y'], 'a🍌1🍌"p🍌q"🍌x🍍y',
+                         delimiter='🍌')
 
     def test_write_escape(self):
         self._write_test(['a',1,'p,q'], 'a,1,"p,q"',
@@ -258,19 +270,26 @@ def test_write_escape(self):
                          escapechar='\\', quoting=csv.QUOTE_MINIMAL)
         self._write_test(['C\\', '6', '7', 'X"'], 'C\\\\,6,7,"X"""',
                          escapechar='\\', quoting=csv.QUOTE_MINIMAL)
+        # SYMBOL FOR ESCAPE
+        self._write_test(['a', 1, 'p,q', 'r\u241bs', 'x\u241ay'],
+                         'a,1,p\u241b,q,r\u241b\u241bs,x\u241ay',
+                         escapechar='\u241b', quoting=csv.QUOTE_NONE)
 
     def test_write_lineterminator(self):
-        for lineterminator in '\r\n', '\n', '\r', '!@#', '\0':
+        for lineterminator in ('\r\n', '\n', '\r', '!@#', '\0',
+                               '\x85', '\u2028', '\U0001f600'):
             with self.subTest(lineterminator=lineterminator):
                 with StringIO() as sio:
                     writer = csv.writer(sio, lineterminator=lineterminator)
                     writer.writerow(['a', 'b'])
                     writer.writerow([1, 2])
                     writer.writerow(['\r', '\n'])
+                    writer.writerow([f'a{lineterminator[-1]}b', 'c'])
                     self.assertEqual(sio.getvalue(),
                                      f'a,b{lineterminator}'
                                      f'1,2{lineterminator}'
-                                     f'"\r","\n"{lineterminator}')
+                                     f'"\r","\n"{lineterminator}'
+                                     f'"a{lineterminator[-1]}b",c{lineterminator}')
 
     def test_write_iterable(self):
         self._write_test(iter(['a', 1, 'p,q']), 'a,1,"p,q"')
diff --git a/Lib/test/test_tkinter/test_font.py b/Lib/test/test_tkinter/test_font.py
index 3d76ae630d97e3..16c9c1dc22bbca 100644
--- a/Lib/test/test_tkinter/test_font.py
+++ b/Lib/test/test_tkinter/test_font.py
@@ -24,6 +24,16 @@ def actual_size(self, desc):
         # The requested size is not always available (e.g. bitmap fonts).
         return self.root.tk.call('font', 'actual', desc, '-size')
 
+    def tcl_font_object(self, desc):
+        # Return a font name or description as a Tcl object representing a
+        # font, as Tk returns for example from ttk.Style().lookup().
+        tk = self.root.tk
+        tk.call('set', '_font', desc)
+        tk.eval('font measure $_font x')  # convert the Tcl object to a font
+        obj = tk.call('set', '_font')
+        tk.call('unset', '_font')
+        return obj
+
     def test_configure(self):
         self.assertEqual(self.font.config, self.font.configure)
         options = self.font.configure()
@@ -150,6 +160,36 @@ def test_existing(self):
         # A name or a description is required.
         self.assertRaises(TypeError, font.Font, root=self.root, exists=True)
 
+    def test_tcl_object(self):
+        # Tk can return a font as a Tcl object (gh-156961).
+        if not self.wantobjects:
+            self.skipTest('Tcl objects are converted to strings')
+        obj = self.tcl_font_object(fontname)
+        self.assertEqual(obj.typename, 'font')
+
+        # It can be used as the name of an existing named font.
+        for f in (font.Font(root=self.root, name=obj, exists=True),
+                  font.nametofont(obj, root=self.root)):
+            # The Tcl object is kept as is, so that it is passed back to Tk.
+            self.assertIs(f.name, obj)
+            self.assertEqual(str(f), fontname)
+            self.assertEqual(f.actual(), self.font.actual())
+            self.assertEqual(f, self.font)
+            self.assertEqual(self.font, f)
+        # Referring to a non-existent named font still fails.
+        self.assertRaisesRegex(tkinter.TclError, 'named font nosuchfont',
+                               font.Font, root=self.root, exists=True,
+                               name=self.tcl_font_object('nosuchfont'))
+
+        # It can also be wrapped as a font description.
+        obj = self.tcl_font_object(('Times', 20, 'bold'))
+        f = font.Font(root=self.root, font=obj, exists=True)
+        self.assertIs(f.name, obj)
+        self.assertEqual(str(f), 'Times 20 bold')
+        self.assertNotIn(f.name, font.names(self.root))
+        self.assertEqual(f.actual('weight'), 'bold')
+        self.assertEqual(f.actual('size'), self.actual_size(('Times', 20, 'bold')))
+
     def test_copy(self):
         # size=-20 (pixels): copy() copies the configured options, so the
         # size is preserved rather than resolved (gh-143990).
diff --git a/Lib/test/test_xml_etree.py b/Lib/test/test_xml_etree.py
index f9ff8c4c3541ed..90e556ec95308b 100644
--- a/Lib/test/test_xml_etree.py
+++ b/Lib/test/test_xml_etree.py
@@ -4211,6 +4211,21 @@ def close(self):
             ('html', '-//W3C//DTD XHTML 1.0 Transitional//EN',
              'http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd'))
 
+        for doctype, expected in [
+            ('<!DOCTYPE html>', ('html', None, None)),
+            ('<!DOCTYPE html [<!ENTITY e "v">]>', ('html', None, None)),
+            ('<!DOCTYPE html SYSTEM "a.dtd">', ('html', None, 'a.dtd')),
+            ('<!DOCTYPE html SYSTEM "a.dtd" [<!ENTITY e "v">]>',
+             ('html', None, 'a.dtd')),
+            ('<!DOCTYPE html PUBLIC "-//P" "a.dtd">', ('html', '-//P', 'a.dtd')),
+            ("<!DOCTYPE\nhtml\nPUBLIC\n'-//P'\n'a.dtd'\n>",
+             ('html', '-//P', 'a.dtd')),
+        ]:
+            with self.subTest(doctype=doctype):
+                parser = ET.XMLParser(target=DoctypeParser())
+                parser.feed(doctype + '<html/>')
+                self.assertEqual(parser.close(), expected)
+
     def test_builder_lookup_errors(self):
         class RaisingBuilder:
             def __init__(self, raise_in=None, what=ValueError):
diff --git a/Lib/tkinter/font.py b/Lib/tkinter/font.py
index 5b663a4e456456..1349e49fbd68a5 100644
--- a/Lib/tkinter/font.py
+++ b/Lib/tkinter/font.py
@@ -104,7 +104,8 @@ def __init__(self, root=None, font=None, name=None, exists=False,
             if exists:
                 self.name = name
                 # confirm font exists
-                if self.name not in tk.splitlist(tk.call("font", "names")):
+                name = getattr(name, 'string', name)  # can be a Tcl object
+                if name not in tk.splitlist(tk.call("font", "names")):
                     raise tkinter._tkinter.TclError(
                         "named font %s does not already exist" % (self.name,))
                 # if font config info supplied, apply it
@@ -123,11 +124,11 @@ def __init__(self, root=None, font=None, name=None, exists=False,
         self._call  = tk.call
 
     def __str__(self):
-        # A wrapped description is a list or tuple, not a string; format it as
-        # a Tcl word so it can be used as an option value (as ttk does).
-        if isinstance(self.name, str):
-            return self.name
-        return tkinter._join(self.name)
+        # A wrapped description can be a list or tuple; format it as a Tcl
+        # word so it can be used as an option value (as ttk does).
+        if isinstance(self.name, (list, tuple)):
+            return tkinter._join(self.name)
+        return str(self.name)
 
     def __repr__(self):
         return f"<{self.__class__.__module__}.{self.__class__.__qualname__}" \
@@ -136,7 +137,13 @@ def __repr__(self):
     def __eq__(self, other):
         if not isinstance(other, Font):
             return NotImplemented
-        return self.name == other.name and self._tk == other._tk
+        name = self.name
+        other_name = other.name
+        if type(name) is not type(other_name):
+            # A Tcl object does not compare equal to a string.
+            name = getattr(name, 'string', name)
+            other_name = getattr(other_name, 'string', other_name)
+        return name == other_name and self._tk == other._tk
 
     def __getitem__(self, key):
         return self.cget(key)
diff --git a/Lib/xml/etree/ElementTree.py b/Lib/xml/etree/ElementTree.py
index bed8c27df5a384..ce98e4dc24a0d3 100644
--- a/Lib/xml/etree/ElementTree.py
+++ b/Lib/xml/etree/ElementTree.py
@@ -1591,10 +1591,10 @@ def __init__(self, *, target=None, encoding=None):
             parser.CommentHandler = target.comment
         if hasattr(target, 'pi'):
             parser.ProcessingInstructionHandler = target.pi
+        parser.StartDoctypeDeclHandler = self._start_doctype
         # Configure pyexpat: buffering, new-style attribute handling.
         parser.buffer_text = 1
         parser.ordered_attributes = 1
-        self._doctype = None
         self.entity = {}
         try:
             self.version = "Expat %d.%d.%d" % expat.version_info
@@ -1713,38 +1713,15 @@ def _default(self, text):
                 err.lineno = self.parser.ErrorLineNumber
                 err.offset = self.parser.ErrorColumnNumber
                 raise err
-        elif prefix == "<" and text[:9] == "<!DOCTYPE":
-            self._doctype = [] # inside a doctype declaration
-        elif self._doctype is not None:
-            # parse doctype contents
-            if prefix == ">":
-                self._doctype = None
-                return
-            text = text.strip(_XML_WHITESPACE)
-            if not text:
-                return
-            self._doctype.append(text)
-            n = len(self._doctype)
-            if n > 2:
-                type = self._doctype[1]
-                if type == "PUBLIC" and n == 4:
-                    name, type, pubid, system = self._doctype
-                    if pubid:
-                        pubid = pubid[1:-1]
-                elif type == "SYSTEM" and n == 3:
-                    name, type, system = self._doctype
-                    pubid = None
-                else:
-                    return
-                if hasattr(self.target, "doctype"):
-                    self.target.doctype(name, pubid, system[1:-1])
-                elif hasattr(self, "doctype"):
-                    warnings.warn(
-                        "The doctype() method of XMLParser is ignored.  "
-                        "Define doctype() method on the TreeBuilder target.",
-                        RuntimeWarning)
-
-                self._doctype = None
+
+    def _start_doctype(self, name, system, pubid, has_internal_subset):
+        if hasattr(self.target, "doctype"):
+            self.target.doctype(name, pubid, system)
+        elif hasattr(self, "doctype"):
+            warnings.warn(
+                "The doctype() method of XMLParser is ignored.  "
+                "Define doctype() method on the TreeBuilder target.",
+                RuntimeWarning)
 
     def feed(self, data):
         """Feed encoded data to parser."""
diff --git a/Misc/NEWS.d/next/Documentation/2026-06-18-16-58-52.gh-issue-59551.oNkjTG.rst b/Misc/NEWS.d/next/Documentation/2026-06-18-16-58-52.gh-issue-59551.oNkjTG.rst
new file mode 100644
index 00000000000000..9842e85f9c2c21
--- /dev/null
+++ b/Misc/NEWS.d/next/Documentation/2026-06-18-16-58-52.gh-issue-59551.oNkjTG.rst
@@ -0,0 +1 @@
+Rename Doc/library/dialog.rst to tkinter.dialogs.rst.
diff --git a/Misc/NEWS.d/next/Library/2026-09-05-22-39-22.gh-issue-156961.ZtYqoA.rst b/Misc/NEWS.d/next/Library/2026-09-05-22-39-22.gh-issue-156961.ZtYqoA.rst
new file mode 100644
index 00000000000000..9df2868c30f16d
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2026-09-05-22-39-22.gh-issue-156961.ZtYqoA.rst
@@ -0,0 +1,3 @@
+Fix :func:`tkinter.font.nametofont` and the :class:`tkinter.font.Font`
+constructor for a font name or description returned by Tk as a Tcl object,
+for example by :meth:`ttk.Style.lookup() <tkinter.ttk.Style.lookup>`.
diff --git a/Misc/NEWS.d/next/Library/2026-09-11-12-00-00.gh-issue-156955.bLtmAp.rst b/Misc/NEWS.d/next/Library/2026-09-11-12-00-00.gh-issue-156955.bLtmAp.rst
new file mode 100644
index 00000000000000..2a452a2a6e1652
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2026-09-11-12-00-00.gh-issue-156955.bLtmAp.rst
@@ -0,0 +1,3 @@
+Speed up :func:`csv.writer` by caching the set of characters that need
+quoting or escaping in the dialect. Writing long fields is now up to 5 times
+faster.
diff --git a/Misc/NEWS.d/next/Library/2026-09-13-10-30-00.gh-issue-157406.a3kZq7.rst b/Misc/NEWS.d/next/Library/2026-09-13-10-30-00.gh-issue-157406.a3kZq7.rst
new file mode 100644
index 00000000000000..53f2bf561eefbb
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2026-09-13-10-30-00.gh-issue-157406.a3kZq7.rst
@@ -0,0 +1,4 @@
+Fix the Python implementation of :class:`xml.etree.ElementTree.XMLParser`:
+the ``doctype()`` method of the target is now called for a document type
+declaration without an external identifier, like ``<!DOCTYPE html>``,
+as in the C implementation.
diff --git a/Modules/_csv.c b/Modules/_csv.c
index c640f2d36a8464..6af66c3f09a03b 100644
--- a/Modules/_csv.c
+++ b/Modules/_csv.c
@@ -117,7 +117,12 @@ typedef struct {
     Py_UCS4 quotechar;          /* quote character */
     Py_UCS4 escapechar;         /* escape character */
     PyObject *lineterminator;   /* string to write between records */
-
+    /* Cache for the writer: bit c is set if the ASCII character c needs
+       quoting or escaping (delimiter, quotechar, escapechar, '\r', '\n'
+       and the characters of lineterminator). */
+    uint64_t special_chars[2];
+    /* Whether any of the special characters is non-ASCII. */
+    bool nonascii_special;
 } DialectObj;
 
 typedef struct {
@@ -332,6 +337,54 @@ _set_str(const char *name, PyObject **target, PyObject *src, const char *dflt)
     return 0;
 }
 
+static void
+dialect_add_special_char(DialectObj *self, Py_UCS4 c)
+{
+    if (c == NOT_SET) {
+        return;
+    }
+    if (c < 128) {
+        self->special_chars[c / 64] |= (uint64_t)1 << (c % 64);
+    }
+    else {
+        self->nonascii_special = true;
+    }
+}
+
+static void
+dialect_init_special_chars_cache(DialectObj *self)
+{
+    self->special_chars[0] = self->special_chars[1] = 0;
+    self->nonascii_special = false;
+    dialect_add_special_char(self, self->delimiter);
+    dialect_add_special_char(self, self->quotechar);
+    dialect_add_special_char(self, self->escapechar);
+    dialect_add_special_char(self, '\r');
+    dialect_add_special_char(self, '\n');
+    PyObject *lt = self->lineterminator;
+    for (Py_ssize_t i = 0; i < PyUnicode_GET_LENGTH(lt); i++) {
+        dialect_add_special_char(self, PyUnicode_READ_CHAR(lt, i));
+    }
+}
+
+/* Whether the character needs quoting or escaping by the writer. */
+static inline bool
+dialect_is_special_char(DialectObj *self, Py_UCS4 c)
+{
+    if (c < 128) {
+        return (self->special_chars[c / 64] >> (c % 64)) & 1;
+    }
+    if (!self->nonascii_special) {
+        return false;
+    }
+    return (c == self->delimiter ||
+            c == self->quotechar ||
+            c == self->escapechar ||
+            PyUnicode_FindChar(self->lineterminator, c, 0,
+                               PyUnicode_GET_LENGTH(self->lineterminator),
+                               1) >= 0);
+}
+
 static int
 dialect_check_quoting(int quoting)
 {
@@ -558,6 +611,7 @@ dialect_new(PyTypeObject *type, PyObject *args, PyObject *kwargs)
     {
         goto err;
     }
+    dialect_init_special_chars_cache(self);
 
     ret = Py_NewRef(self);
 err:
@@ -1208,14 +1262,7 @@ join_append_data(WriterObj *self, int field_kind, const void *field_data,
         Py_UCS4 c = PyUnicode_READ(field_kind, field_data, i);
         int want_escape = 0;
 
-        if (c == dialect->delimiter ||
-            c == dialect->escapechar ||
-            c == dialect->quotechar  ||
-            c == '\n'  ||
-            c == '\r'  ||
-            PyUnicode_FindChar(
-                dialect->lineterminator, c, 0,
-                PyUnicode_GET_LENGTH(dialect->lineterminator), 1) >= 0) {
+        if (dialect_is_special_char(dialect, c)) {
             if (dialect->quoting == QUOTE_NONE)
                 want_escape = 1;
             else {