Minor fixes

Author: SolidAlloy

Editor/Drawers/TypeReferencePropertyDrawer.cs

@@ -15,7 +15,7 @@ public sealed class TypeReferencePropertyDrawer : PropertyDrawer
     {
         public override float GetPropertyHeight(SerializedProperty property, GUIContent label)
         {
-            return EditorStyles.popup.CalcHeight(GUIContent.none, 0);
+            return EditorStyles.popup.CalcHeight(GUIContent.none, 0f);
         }
 
         public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
@@ -40,7 +40,7 @@ private void DrawTypeReferenceField(Rect position, SerializedProperty property)
 
             var selectedType = TypeCache.GetType(serializedTypeRef.TypeNameAndAssembly);
 
-            if (selectedType != null && !typeOptionsAttribute.MatchesRequirements(selectedType))
+            if (selectedType != null && ! typeOptionsAttribute.MatchesRequirements(selectedType))
             {
                 Debug.Log($"{property.name} had the {selectedType} value but the type does not match " +
                           "constraints set in the attribute, so it was set to null.");

Editor/Util/SerializedTypeReference.cs

@@ -13,7 +13,6 @@ internal class SerializedTypeReference
         private readonly SerializedProperty _typeNameProperty;
         private readonly SerializedProperty _guidProperty;
         private readonly SerializedProperty _guidAssignmentFailedProperty;
-        private readonly TypeReference _typeRefInstance;
 
         public SerializedTypeReference(SerializedProperty typeReferenceProperty)
         {