A rewrite replaces a file only when the runtime's own reader opens it. C#
drops ReadStoreHeader (a second, header-only verdict that let a flush replace
files the reader refuses) and asks DeserializeSnapshot from open, flush and
commit; the reader now requires exactly one array, so C# refuses bytes after
the store on read as TS and Python do. A zero-byte file is an empty store for
all three paths. CultMesh.WriteSingleFileDocument reads the file it replaces
through the Mesh reader before writing. Rust reads and rewrites through one
classification (trailing bytes refused on read; a non-store first slot must be a
legacy envelope array the reader accepts). TypeScript checks a legacy array with
pullAll's own decoder before replacing it. Python already conformed.
Shared byte vectors and per-runtime verdicts live in
tests/vectors/document-variants-c2a/readability; every runtime's test reads
them. Holds gains second-dictionary-value and second-list-item cases. The
persistence format contract now marks v3 by content and states the readability
rule.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
CultElementIds.Holds is the one fact a store marks its header by; a test now
drives it directly over a dictionary value, a list of lists, a list under an
unset element and an element, and over unset ids that hold nothing, so a
mutant that skips any of those branches fails.
C# ReadStoreHeader refused a first-slot string without the cultcache.store.
prefix and then ran RequireSingleFileFormat, which refuses every string that
is not v1, v2 or v3 anyway. The prefix check is gone; a non-header string is
refused as a format this runtime does not read.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Engine tests for the plan (duplicates, format, empty derived source, atomicity, two
cultures, interface unions, key sharing); cache tests for the marker on single-file and
directory stores, override values on write and load, minting that is given back, and the
in-memory-only mark.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
[CultElementId(nameof(Member))] declares an id derived from that member's
invariant text, never random, so content-addressed elements keep encoding to the
same bytes. CultMeshCdnChunkRef derives its id from Offset; PackArtifact sets
it, the Rust pack_content writes it, and the committed content vectors are
re-cut once so both runtimes carry it. Engine tests drive Problems and Assign
directly (InternalsVisibleTo the Caching tests).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
