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Zhengchao An
8eba7bb9be
xl.meta roundtrip coverage was one fixed example test plus byte-level no-panic fuzz properties; nothing generated STRUCTURED version graphs, so a lossy encoding bug in version headers, ordering, delete markers, or the dual internal-metadata-key handling would only surface if the fixed example happened to hit it. Add crates/filemeta/tests/version_graph_roundtrip_proptest.rs with two generated-input properties over multi-version graphs (1-7 versions, ~30% delete markers, deliberately colliding mod_times to exercise tie-break ordering, user metadata, and the AGENTS.md dual x-rustfs-internal-*/x-minio-internal-* keys written via the real insert_bytes helper): - version_graph_marshal_load_roundtrip: marshal -> load preserves version count, meta_ver, the exact (id, type) sequence, full headers, fully decoded per-version content, delete-marker payload shape, and both internal metadata key forms with identical values. - version_graph_marshal_is_idempotent: marshal(load(marshal(x))) is byte-identical to marshal(x), catching encoders that mutate or reorder state on the way out. Complements the existing byte-level no-panic properties: those prove hostile bytes cannot crash the decoder; these prove honest graphs are encoded losslessly. Refs: backlog#1151 (sec-10)