fix: unexpectedly sort the keys when building a table

Signed-off-by: Frost Ming <[email protected]>

Author: frostming

tests/test_toml_document.py

@@ -1072,3 +1072,15 @@ def test_parse_subtables_no_extra_indent():
 """
     doc = parse(expected)
     assert doc.as_string() == expected
+
+
+def test_item_preserves_the_order():
+    t = tomlkit.inline_table()
+    t.update({"a": 1, "b": 2})
+    doc = {"name": "foo", "table": t, "age": 42}
+    expected = """\
+name = "foo"
+table = {a = 1, b = 2}
+age = 42
+"""
+    assert tomlkit.dumps(doc) == expected

tomlkit/items.py

@@ -155,7 +155,7 @@ def item(value: Any, _parent: Item | None = None, _sort_keys: bool = False) -> I
         val = table_constructor(Container(), Trivia(), False)
         for k, v in sorted(
             value.items(),
-            key=lambda i: (isinstance(i[1], dict), i[0] if _sort_keys else 1),
+            key=lambda i: (isinstance(i[1], dict), i[0]) if _sort_keys else 1,
         ):
             val[k] = item(v, _parent=val, _sort_keys=_sort_keys)