https://github.com/python/cpython/commit/a6f3b6144df9f8b66705399033825b1e3e82d141
commit: a6f3b6144df9f8b66705399033825b1e3e82d141
branch: 3.13
author: Miss Islington (bot) <[email protected]>
committer: encukou <[email protected]>
date: 2026-06-04T11:50:19+02:00
summary:

[3.13] Correct Stable ABI documentation for METH_FASTCALL (GH-149593) 
(GH-150851)

The current documentation says:

>
> METH_FASTCALL
>    Part of the Stable ABI since version 3.7.
>
> [...]
>
>   Added in version 3.7.
>
>    Changed in version 3.10: METH_FASTCALL is now part of the stable ABI.

so is contradictory about when it was added to the Stable ABI.  Looking at the 
header it seems like 3.10 is right.
(cherry picked from commit 58beae7319c58d850184d621d6635de23f71a229)

Co-authored-by: da-woods <[email protected]>

files:
M Doc/data/stable_abi.dat
M Misc/stable_abi.toml

diff --git a/Doc/data/stable_abi.dat b/Doc/data/stable_abi.dat
index 9156c24ef16cd03..923742077ea7a2c 100644
--- a/Doc/data/stable_abi.dat
+++ b/Doc/data/stable_abi.dat
@@ -1,7 +1,7 @@
 role,name,added,ifdef_note,struct_abi_kind
 macro,METH_CLASS,3.2,,
 macro,METH_COEXIST,3.2,,
-macro,METH_FASTCALL,3.7,,
+macro,METH_FASTCALL,3.10,,
 macro,METH_METHOD,3.7,,
 macro,METH_NOARGS,3.2,,
 macro,METH_O,3.2,,
diff --git a/Misc/stable_abi.toml b/Misc/stable_abi.toml
index ddae123e1fa5fcd..729e05319bbb8ed 100644
--- a/Misc/stable_abi.toml
+++ b/Misc/stable_abi.toml
@@ -1787,7 +1787,6 @@
 [const.METH_COEXIST]
     added = '3.2'
 # METH_STACKLESS is undocumented
-# METH_FASTCALL is not part of limited API.
 
 # The following are defined in private headers, but historically
 # they were exported as part of the stable ABI.
@@ -2121,8 +2120,6 @@
 
 # New method flags in 3.7 (PEP 590):
 
-[const.METH_FASTCALL]
-    added = '3.7'
 [const.METH_METHOD]
     added = '3.7'
 
@@ -2272,6 +2269,10 @@
 [data.PyStructSequence_UnnamedField]
     added = '3.11'
 
+# Added in 3.7 but in the Stable ABI from 3.10
+[const.METH_FASTCALL]
+    added = '3.10'
+
 # Add stable Py_buffer API in Python 3.11 (https://bugs.python.org/issue45459)
 [struct.Py_buffer]
     added = '3.11'

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