diff --git a/README.md b/README.md
index f177db0..2ac78dc 100644
--- a/README.md
+++ b/README.md
@@ -34,8 +34,8 @@ import bpy
 
 # Full autocomplete and type checking
 obj = bpy.context.active_object
-if obj is not None:
-    print(obj.name)
+assert obj is not None
+obj.location.x = 1.0
 
 # Collection types with proper methods
 bpy.data.objects.new("Cube", bpy.data.meshes.new("Mesh"))
diff --git a/introspect.py b/introspect.py
index bc657e2..6ae06bf 100644
--- a/introspect.py
+++ b/introspect.py
@@ -2138,6 +2138,21 @@ def rna_property_to_type(prop: object) -> str:
         if array_length == 0 and is_array:
             # Dynamic-length array — at runtime this is a bpy_prop_array
             return f"bpy_prop_array[{base}]"
+        # Fixed-length float arrays with vector/matrix subtypes are mathutils types
+        subtype: str = getattr(prop, "subtype", "NONE")
+        if prop_type == "float" and subtype in (
+            "TRANSLATION", "DIRECTION", "VELOCITY", "ACCELERATION",
+            "XYZ", "XYZ_LENGTH",
+        ):
+            return "mathutils.Vector"
+        if prop_type == "float" and subtype == "EULER":
+            return "mathutils.Euler"
+        if prop_type == "float" and subtype == "QUATERNION":
+            return "mathutils.Quaternion"
+        if prop_type == "float" and subtype in ("COLOR", "COLOR_GAMMA") and array_length == 3:
+            return "mathutils.Color"
+        if prop_type == "float" and subtype == "MATRIX":
+            return "mathutils.Matrix"
         return f"list[{base}]"
 
     return RNA_TYPE_MAP.get(prop_type, prop_type)
diff --git a/main.py b/main.py
index e8ac04c..f0bc2a0 100644
--- a/main.py
+++ b/main.py
@@ -186,8 +186,8 @@ pip install "blender-python-stubs>={major_minor},<{next_minor}"
 import bpy
 
 obj = bpy.context.active_object
-if obj is not None:
-    print(obj.name)
+assert obj is not None
+obj.location.x = 1.0
 
 bpy.data.objects.new("Cube", bpy.data.meshes.new("Mesh"))
 ```
diff --git a/overrides/5.1/gpu.types.json b/overrides/5.1/gpu.types.json
new file mode 100644
index 0000000..cc0037f
--- /dev/null
+++ b/overrides/5.1/gpu.types.json
@@ -0,0 +1,7 @@
+{
+  "GPUShader.uniform_float": {
+    "params": {
+      "value": "float | int | Sequence[float] | mathutils.Matrix | mathutils.Vector | mathutils.Euler | mathutils.Quaternion | mathutils.Color"
+    }
+  }
+}