[3.13] gh-99875: Document rounding mode for old-style formatting (GH-126382) (#145812)

miss-islington · skirpichev · web-flow · commit 17a9c2691ef2 · 2026-03-11T13:31:51.000Z
gh-99875: Document rounding mode for old-style formatting (GH-126382) (cherry picked from commit ce1abaf) Co-authored-by: Sergey B Kirpichev <skirpichev@gmail.com>
diff --git a/Doc/library/stdtypes.rst b/Doc/library/stdtypes.rst
@@ -3012,6 +3012,10 @@ The conversion types are:
 |            | character in the result.                            |       |
 +------------+-----------------------------------------------------+-------+
 
+For floating-point formats, the result should be correctly rounded to a given
+precision ``p`` of digits after the decimal point.  The rounding mode matches
+that of the :func:`round` builtin.
+
 Notes:
 
 (1)
