From cfc1e32234a77f19c40052687689c22d155653be Mon Sep 17 00:00:00 2001
From: Alvaro Balbin <153404840+AlvaroBalbin@users.noreply.github.com>
Date: Fri, 30 Oct 2026 13:05:07 +0000
Subject: [PATCH] Accept buffer inputs in email.base64mime.header_length

---
 stdlib/email/base64mime.pyi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/stdlib/email/base64mime.pyi b/stdlib/email/base64mime.pyi
index 945d2bb52c1f..f19cd92c2f12 100644
--- a/stdlib/email/base64mime.pyi
+++ b/stdlib/email/base64mime.pyi
@@ -2,7 +2,7 @@ __all__ = ["body_decode", "body_encode", "decode", "decodestring", "header_encod
 
 from _typeshed import ReadableBuffer
 
-def header_length(bytearray: str | bytes | bytearray) -> int: ...
+def header_length(bytearray: str | bytes | bytearray | memoryview) -> int: ...
 def header_encode(header_bytes: str | ReadableBuffer, charset: str = "iso-8859-1") -> str: ...
 
 # First argument should be a buffer that supports slicing and len().