Guard against dataclass types in jsonable implementation

python/ruff-ecosystem/pyproject.toml

@@ -10,6 +10,6 @@ dependencies = ["unidiff==0.7.5"]
 [project.scripts]
 ruff-ecosystem = "ruff_ecosystem.cli:entrypoint"
 
-
 [tool.ruff]
-extend-select = ["I"]
+extend-select = ["I"]
+preview = true

python/ruff-ecosystem/ruff_ecosystem/check.py

@@ -4,11 +4,11 @@ Execution, comparison, and summary of `ruff check` ecosystem checks.
 from __future__ import annotations
 
 import asyncio
+import dataclasses
 import re
 import time
 from asyncio import create_subprocess_exec
 from collections import Counter
-import dataclasses
 from dataclasses import dataclass, field
 from pathlib import Path
 from subprocess import PIPE
@@ -17,8 +17,8 @@ from typing import TYPE_CHECKING, Iterable, Iterator, Self, Sequence
 from ruff_ecosystem import logger
 from ruff_ecosystem.markdown import (
     markdown_details,
-    markdown_project_section,
     markdown_plus_minus,
+    markdown_project_section,
 )
 from ruff_ecosystem.types import (
     Comparison,

python/ruff-ecosystem/ruff_ecosystem/types.py

@@ -17,7 +17,7 @@ class Serializable(abc.ABC):
 
     def jsonable(self) -> Any:
         # Default implementation for dataclasses
-        if is_dataclass(self):
+        if is_dataclass(self) and not isinstance(self, type):
             return dataclasses.asdict(self)
 
         raise NotImplementedError()