From 16d3f27c43c5ca44812e776325d0633f62e8b5bb Mon Sep 17 00:00:00 2001
From: John Sirois <john.sirois@gmail.com>
Date: Mon, 13 Jan 2025 14:47:51 -0800
Subject: [PATCH] Fix `ptex` being included in all scies.

Only include it when needed.
---
 CHANGES.md                        | 6 ++++++
 science/__init__.py               | 2 +-
 science/dataclass/deserializer.py | 2 ++
 uv.lock                           | 2 +-
 4 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/CHANGES.md b/CHANGES.md
index af1c101..4b7a804 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,5 +1,11 @@
 # Release Notes
 
+## 0.11.2
+
+This release fixes a bug introduced in the 0.11.0 release whereby a `ptex` binary was always
+included in each built scie even when the scie did not use `ptex`. This was functionally harmless
+but did bloat the size of the resulting scie binary by ~5MB.
+
 ## 0.11.1
 
 This release brings two fixes for `science` on Windows:
diff --git a/science/__init__.py b/science/__init__.py
index 28c292a..38f28ae 100644
--- a/science/__init__.py
+++ b/science/__init__.py
@@ -3,6 +3,6 @@
 
 from packaging.version import Version
 
-__version__ = "0.11.1"
+__version__ = "0.11.2"
 
 VERSION = Version(__version__)
diff --git a/science/dataclass/deserializer.py b/science/dataclass/deserializer.py
index da240ef..d6816b7 100644
--- a/science/dataclass/deserializer.py
+++ b/science/dataclass/deserializer.py
@@ -41,6 +41,8 @@ def _parse_field(
                 ),
             ),
         )
+        if not data_value and default is None:
+            return cast(_F, None)
         return cast(_F, parse(data_value, dataclass_type, custom_parsers=custom_parsers))
 
     if type_.istype(int):
diff --git a/uv.lock b/uv.lock
index cce1f6d..22c51fd 100644
--- a/uv.lock
+++ b/uv.lock
@@ -517,7 +517,7 @@ wheels = [
 
 [[package]]
 name = "science"
-version = "0.11.1"
+version = "0.11.2"
 source = { editable = "." }
 dependencies = [
     { name = "appdirs" },