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Sydney RunkleandClaude Sonnet 4.6
f80a18b376
delta.py — value consistency:
- `__init__` now starts with `value=MISSING` (was `[]`); both fresh
construction and clones are consistently uninitialised until
`from_checkpoint()` or `copy()` sets the real value
- `_clone_empty` drops `__new__` in favour of the normal constructor;
`typ` and `key` are restored explicitly afterwards (`typ` may differ
from `list` when set via Annotated injection; `key` is injected by
the graph builder after construction)
delta.py — snapshot cadence:
- `is_snapshot_step` now guards `step > 0`; snapshots fire at steps N,
2N, 3N, … instead of also at step 0 where `0 % N == 0` always held
_checkpoint.py — runtime guards:
- replace both `assert isinstance(spec, DeltaChannel)` with proper
`if not isinstance: raise TypeError`; `assert` is stripped by `-O`
and is wrong for production invariant checks
binop.py — avoid unnecessary allocation:
- `_get_overwrite`: replace `set(value.keys()) == {OVERWRITE}` with
`len(value) == 1 and OVERWRITE in value` to avoid allocating a
throwaway set on every call
checkpoint-postgres — typed rows:
- add `_DeltaCombinedRow(TypedDict, total=False)` documenting the nine
columns emitted by `SELECT_DELTA_COMBINED_SQL`'s UNION ALL; change
`_build_delta_channel_writes_history` parameter from `Sequence[Any]`
to `Sequence[_DeltaCombinedRow]`; call sites cast the psycopg
`DictRow` result accordingly
Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>