ultimate-notion / ultimate-notion / 27916879614

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Replace cast downcasts with isinstance guards (#254)

Remove five `cast` calls in `blocks.py` and `view.py`, replacing the
downcasts with `isinstance` guards that raise `TypeError` (matching the
existing narrowing idiom, since ruff S101 disallows asserts in source).
In `_chunk_blocks_for_api`, the cast is dropped entirely by zipping the
already-typed `cols.columns` alongside the column nodes.

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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