From e70bf99a89f27102247613bcd5d1aa8923a1cda9 Mon Sep 17 00:00:00 2001
From: "typesafe-public-bot[bot]"
 <321128928+typesafe-public-bot[bot]@users.noreply.github.com>
Date: Fri, 9 Oct 2026 15:46:17 +0000
Subject: [PATCH] Release v0.7.4

Co-authored-by: Daniel Gafni <danielgafni16@gmail.com>
---
 docs/changelog.md              |  6 ++++++
 pyproject.toml                 |  2 +-
 src/typesafe_sdk/_core/json.py |  3 ++-
 tests/test_clients.py          | 15 +++++++++++++++
 uv.lock                        |  2 +-
 5 files changed, 25 insertions(+), 3 deletions(-)

diff --git a/docs/changelog.md b/docs/changelog.md
index 9c83a8d..c78e9bd 100644
--- a/docs/changelog.md
+++ b/docs/changelog.md
@@ -5,6 +5,12 @@ icon: lucide/history
 
 # Changelog
 
+## v0.7.4 (2026-10-09)
+
+### Bug fixes
+
+- serialize non-finite numbers as strings instead of invalid JSON tokens
+
 ## v0.7.3 (2026-10-09)
 
 ### Bug fixes
diff --git a/pyproject.toml b/pyproject.toml
index a7b8a0c..6063588 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "typesafe-sdk"
-version = "0.7.3"
+version = "0.7.4"
 description = "Python SDK for TypeSafe AI API."
 readme = "README.md"
 license = "MIT"
diff --git a/src/typesafe_sdk/_core/json.py b/src/typesafe_sdk/_core/json.py
index 29337b0..78c1eab 100644
--- a/src/typesafe_sdk/_core/json.py
+++ b/src/typesafe_sdk/_core/json.py
@@ -23,7 +23,8 @@ def _fallback(value: object) -> object:
 
 
 def serialize(value: object) -> bytes:
-    return to_json(value, fallback=_fallback)
+    # JSON has no NaN/Infinity tokens; emit them as the strings "NaN"/"Infinity"/"-Infinity" instead.
+    return to_json(value, fallback=_fallback, inf_nan_mode="strings")
 
 
 def deserialize(content: bytes) -> Any:
diff --git a/tests/test_clients.py b/tests/test_clients.py
index d96f0f2..f0fe3ca 100644
--- a/tests/test_clients.py
+++ b/tests/test_clients.py
@@ -161,6 +161,21 @@ async def test_unserializable_request_body_raises(clients: ClientFactory) -> Non
         )
 
 
+async def test_non_finite_numbers_are_stringified(clients: ClientFactory) -> None:
+    def handler(request: httpx2.Request) -> httpx2.Response:
+        body = from_json(request.content, allow_inf_nan=False)
+        assert body["state"] == {"value": "NaN", "arr": [1.0, "Infinity", "-Infinity"]}
+        assert body["temperature"] == "NaN"
+        return httpx2.Response(200, content=to_json(RESULT))
+
+    await system_one(
+        clients(handler),
+        state={"value": float("nan"), "arr": [1.0, float("inf"), float("-inf")]},
+        questions={"q": {"type": "noul", "instructions": "?"}},
+        extra_body={"temperature": float("nan")},
+    )
+
+
 async def test_raw_question_passthrough(clients: ClientFactory) -> None:
     # Explicit escape hatch for fields introduced by the API before this SDK models them.
     questions = cast(
diff --git a/uv.lock b/uv.lock
index a3adad4..76f5bf4 100644
--- a/uv.lock
+++ b/uv.lock
@@ -1238,7 +1238,7 @@ wheels = [
 
 [[package]]
 name = "typesafe-sdk"
-version = "0.7.3"
+version = "0.7.4"
 source = { editable = "." }
 dependencies = [
     { name = "httpx2" },