The reflective registry now decides persistence from the same two facts
MessagePack 3.1.7's DynamicObjectResolver uses: whether it can assign a keyed
member after construction, and which constructor it picks.
- Every keyed public member is discovered, get-only properties included.
MessagePack writes them all; the registry used to leave a get-only property
out of the catalog and schema id even when a constructor filled it.
- MessagePack picks the [SerializationConstructor] if marked, otherwise the
longest visible constructor whose parameters take the keyed members by
position (probed: a longer non-matching constructor falls back to a shorter
one). A member it cannot assign is read back only when its slot is below
that constructor's parameter count.
- A readonly field is assignable under AllowPrivate (probed: round-trips with
only a parameterless constructor), and otherwise only through the picked
constructor. Keyed readonly fields that constructor fills are accepted.
- A keyed member MessagePack writes but never reads back is refused with a
message naming the constructor position: a get-only property, a readonly
field without AllowPrivate, or a non-public setter without AllowPrivate,
when the picked constructor does not fill it (probed: loaded as default).
- An unkeyed public get-only property is refused; MessagePack throws "all
public members must mark KeyAttribute or IgnoreMemberAttribute". The unkeyed
message now names both fixes.
Schema ids change for five GameCult.Eve.Surface documents, whose keyed members
are all get-only properties filled by a [SerializationConstructor]:
gamecult.eve.surface, gamecult.eve.asset_catalog,
gamecult.eve.command_invocation, gamecult.eve.command_receipt and
gamecult.eve.provider_advertisement (EveProviderAdvertisementDocument). Their
catalogs gain those members. No .cc store under F:\Projects holds records of
these schemas: the gamecult.eve.provider_advertisement catalog in Gjallar's
scratch smoke stores belongs to GjallarProviderAdvertisementRecord, which has
no get-only members, and every other hit is prose or a git tree listing.
Consumer registration scan (CultLib src/tests/tools/samples, Ymir.Core,
Gjallar, AquaSynth Core/Faust, Mimir): 148 types register; the two rejections
(CounterState string key, BenchItem without [MessagePackObject]) are rejected
on 9139bf3 too.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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