=== ValueWriteMode::InsertOnce direct uses === src/persistent_artrie/overlay_write_mode.rs:794: ValueWriteMode::InsertOnce => { src/persistent_artrie/lockfree_cas.rs:539: /// the in-loop InsertOnce/CAS pre-check on the freshly-loaded root. src/persistent_artrie_char/overlay_write_mode.rs:474: ValueWriteMode::InsertOnce => { src/persistent_artrie_char/lockfree_cas.rs:1285: /// the in-loop InsertOnce/CAS pre-check on the freshly-loaded root. src/persistent_artrie_char/lockfree_cas.rs:1844: // DURABLE → value seam publish in InsertOnce mode → rank-or-burn) — is the src/persistent_artrie_core/overlay/durable_write.rs:96: InsertOnce, src/persistent_artrie_core/overlay/durable_write.rs:361: /// [`ValueWriteMode::InsertOnce`] (step 2) → rank-or-burn (step 3). Returns src/persistent_artrie_core/overlay/durable_write.rs:393: match self.value_publish_inner(key_bytes, value, ValueWriteMode::InsertOnce)? {