[FanWu-ai]

Summary

Completion.__hash__ hashes self.display, but the constructor always normalizes that field to FormattedText, a list subclass. Consequently even hash(Completion("example")) raises TypeError, preventing completion objects from being used as dictionary keys or in sets.

Hash the completion text and start position instead. Equal completions already share those fields, so the equality/hash contract is maintained without requiring display or metadata to be hashable and without evaluating lazy metadata. Unequal completions with matching text/position may share a hash, which is permitted and is resolved by the existing equality implementation.

Tests cover default displays and dictionary/set use, formatted display plus formatted metadata, and lazy metadata that must not be evaluated.

Validation

• Pristine complete suite: 156 passed.
• New regressions against original code: all 3 fail with unhashable FormattedText.
• Fixed complete suite, with coverage: 159 passed.
• All configured pre-commit hooks passed via uv run prek run --all-files.
• CI commands ruff check, ruff format --check, typos, and strict mypy for win32/linux/darwin passed.
• Source distribution and wheel built with uv build --no-sources.

AI assistance was used to investigate, implement, and test this change. No human review or remote CI success is claimed.