8000 docs(spec): bindings map their largest count to the never-checkpoint sentinel (#322) by adityamukho · Pull Request #472 · project-minigraf/minigraf · GitHub
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docs(spec): bindings map their largest count to the never-checkpoint sentinel (#322) #472

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adityamukho merged 1 commit into from
Oct 7, 2026
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docs(spec): bindings map their largest count to the never-checkpoint sentinel (#322) #472

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5 changes: 5 additions & 0 deletions docs/superpowers/specs/2026-10-07-binding-etl-surface-design.md
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Expand Up @@ -87,6 +87,11 @@ same code and text, and `docs/ERROR_REFERENCE.md` stays the one registry.
(`i64`, `i32` for batch sizes): Kotlin's `ULong`/`UInt` are name-mangled and cannot
be called from Java. A negative or oversized value is `API-017`. C and JSON use
unsigned integers and `size_t`. An absent field keeps the Rust default.
Core's `wal_checkpoint_threshold == usize::MAX` sentinel (no automatic checkpoint
and none on close, #322) is out of reach of a signed count, so the UniFFI shim maps
`i64::MAX` to it, and Node, whose numbers stop at 2^53, maps
`Number.MAX_SAFE_INTEGER` and above. Bindings name it (`WAL_CHECKPOINT_NEVER`,
`walCheckpointNever`) and test that a closed handle keeps its WAL.
8. **Kotlin renames `close`.** UniFFI's Kotlin objects are `AutoCloseable`, and
`close()` frees the Rust object, which releases a cursor or fact log and abandons an
unfinished writer. The shim's own `close` methods clash with it, so the Kotlin
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