A reader can reject a property name while its type declares that property
as optional never. Dropping it from the extracted schema makes a future
optional JSON value look additive, although the existing reader refuses it.
The type history must retain that explicit prohibition.
Support the argument-free @persistenceReserved marker only on optional
properties whose values are never or undefined. Keep those properties as
optional primitive-never nodes, so later JSON values change an existing
field and require a version bump. Reject invalid placement, arguments,
repeated tags, required or JSON-valued declarations, and mapped uses that
violate the reservation. Keep every unmarked omission rule unchanged.
The classification regression failed before this change with an additive
optional-property result and now requires a type-change bump. All fifteen
focused reservation cases and all 210 tooling tests pass, including inherited
fields, misuse, and unmarked preservation. Host typecheck, scoped lint, and
pairing pass. Regeneration leaves the unannotated baseline catalog and
inventory byte-identical; all 61 roots still match their existing history.
No runtime property is activated in this tooling commit.
Tianyi Cui
c6e62ff971