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Ran 22 Jun 2026 09:40AM UTC

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Committed 22 Jun 2026 09:35AM UTC coverage: 87.309% (-0.04%) from 87.351%

Job # 27943430721.5

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push

github

Committed by

web-flow

Commit Message

Replace cast downcasts with isinstance guards in core and session (#264)

Remove four `cast` downcasts, replacing each with an `isinstance` guard
that narrows for the type checker and raises `TypeError` otherwise,
matching the existing narrowing idiom (e.g. the sibling `_cache_get`):

- `Wrapper.wrap_obj_ref` collapses both branches onto a single `hl_obj`,
  then narrows it to `Self` via `isinstance(hl_obj, cls)` (`cls` is
  `type[Self]`), covering both the direct-build and recursive-resolve
  cases. Drops two `cast(Self, ...)` calls.
- `Session._cache_add` narrows the `setdefault` result with
  `isinstance(cached, type(obj))`, mirroring `_cache_get`.

Both files can now drop their unused `cast` import.

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

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