Declare properties as class attributes rather than via methods

.github/workflows/ci.yml

@@ -29,13 +29,10 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [ "3.8", "3.9", "3.10", "3.11", "3.12-dev" ]
+        python-version: [ "3.8", "3.9", "3.10", "3.11", "3.12" ]
         include:
           - experimental: false
 
-          - python-version: "3.12-dev"
-            experimental: true
-
     steps:
     - name: Checkout
       uses: actions/checkout@v4.1.1

changes/141.feature.rst

@@ -0,0 +1 @@
+Validated properties of styles can now be defined as dataclass class attributes.