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…et serialization - _transform.py: `_async_transform_recursive` was calling the *sync* `_transform_recursive` when the annotated type was `Dict[str, T]`. This meant type aliases inside the dict values were never applied in the async path. Fixed by awaiting `_async_transform_recursive` instead. - _utils.py: `required_args` built the list of missing arguments from a `set` subtraction, producing a non-deterministic error message across Python runs. Changed to `sorted(...)` so the message is always stable. - _utils.py: `json_safe` now converts `set` and `frozenset` to a sorted list so they can be serialised to JSON without raising a TypeError. - _utils.py: clarify `deepcopy_minimal` docstring — tuples are intentionally not copied because they are immutable containers. - _compat.py: `ConfigDict` under Pydantic v1 was silently set to `None`. It now raises a clear `RuntimeError` if instantiated, pointing users towards upgrading to Pydantic v2. Tests added for all of the above changes. https://claude.ai/code/session_01CqXN7tjqqv1rCwTMkEmbFb
…k, and more Bug fixes: - _files.py: fix missing f-prefix on f-string in async_to_httpx_files error message - _streaming.py: narrow broad `except Exception` to `except json.JSONDecodeError` when parsing error body from SSE, preventing accidental swallowing of errors - _qs.py: raise NotImplementedError for unknown nested_format values (resolves existing TODO comment) Streaming improvements: - lib/streaming/_messages.py: add index bounds validation for content_block_start and content_block_delta events; align input_json_delta error handling with beta - lib/streaming/_beta_messages.py: add same index bounds validation New feature — on_retry callback: - _base_client.py: add `RetryInfo` dataclass (attempt, max_retries, url, wait_seconds, response, error) and `on_retry` callback parameter to BaseClient, SyncAPIClient, and AsyncAPIClient; callback is invoked before each retry sleep - _client.py: thread `on_retry` through Anthropic and AsyncAnthropic constructors and copy() / with_options() methods - __init__.py: export RetryInfo in public API Tests: - tests/test_qs.py: add test_unknown_nested_format https://claude.ai/code/session_01CqXN7tjqqv1rCwTMkEmbFb
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