Don't insert entries that are equally "new" to stored ones

Both entries would be valid according to the spec, so we take the one with less computation.
Most likely happens when the entries are identical, which can happen during syncs.

src/store/store.ts

@@ -355,13 +355,25 @@ export class Store<
         };
       }
 
-      const otherPayloadLengthIsGreater =
-        entry.payloadLength < otherEntry.payloadLength;
-
       // If the timestamps and hashes are the same, and the other payload's length is greater, we have a no-op.
       if (
         otherEntry.timestamp === entry.timestamp &&
-        payloadDigestOrder === 0 && otherPayloadLengthIsGreater
+        payloadDigestOrder === 0 &&
+        entry.payloadLength < otherEntry.payloadLength
+      ) {
+        this.ingestionMutex.release(acquisitionId);
+
+        return {
+          kind: "no_op",
+          reason: "obsolete_from_same_subspace",
+        };
+      }
+
+      // If all three qualities are the same, neither is newer than the other. So we can also have a no-op.
+      if (
+        otherEntry.timestamp === entry.timestamp &&
+        payloadDigestOrder === 0 &&
+        entry.payloadLength === otherEntry.payloadLength
       ) {
         this.ingestionMutex.release(acquisitionId);