From cb3a8ca0199c86e8190a76377506cbdcbef3c38c Mon Sep 17 00:00:00 2001
From: Pedro Lobato <69770518+Lob26@users.noreply.github.com>
Date: Tue, 10 Feb 2026 09:52:05 -0500
Subject: [PATCH] Final fix so tests works nicely

---
 fastapi/encoders.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fastapi/encoders.py b/fastapi/encoders.py
index 453bd3556..879def72e 100644
--- a/fastapi/encoders.py
+++ b/fastapi/encoders.py
@@ -321,7 +321,9 @@ def jsonable_encoder(
                 encoded_dict[encoded_key] = encoded_value
         return encoded_dict
 
-    if isinstance(obj, (Sequence, GeneratorType)):
+    # Note that we check for `Sequence` and not `list` because we want to support any kind of sequence, like `list`, `tuple`, `set`, etc.
+    # Also, we check that it's not a `bytes` object, because `bytes` is also a `Sequence`, but we want to rely on the TYPE_ENCODERS for `bytes` and avoid code duplication.
+    if isinstance(obj, (Sequence, GeneratorType)) and not isinstance(obj, bytes):
         encoded_list = []
         for item in obj:
             encoded_list.append(