consensus: Allow revisions to set MaxRevisionNumber

.changesets/allow-max-revision.md

@@ -0,0 +1,7 @@
+---
+default: minor
+---
+
+# Allow revisions to set MaxRevisionNumber
+
+`MaxRevisionNumber` was previously used to finalize contracts, but that is not the case anymore, so the restriction can be removed.

consensus/validation.go

@@ -761,10 +761,6 @@ func validateV2FileContracts(ms *MidState, txn types.V2Transaction) error {
 			return fmt.Errorf("file contract revision %v parent (%v) %s", i, fcr.Parent.ID, err)
 		} else if cur.ProofHeight < ms.base.childHeight() {
 			return fmt.Errorf("file contract revision %v cannot be applied to contract after proof height (%v)", i, cur.ProofHeight)
-		} else if rev.RevisionNumber == types.MaxRevisionNumber {
-			// NOTE: disallowing this means that resolutions always take
-			// precedence over revisions
-			return fmt.Errorf("file contract revision %v resolves contract", i)
 		} else if err := validateRevision(fcr.Parent, rev); err != nil {
 			return fmt.Errorf("file contract revision %v %s", i, err)
 		}

consensus/validation_test.go

@@ -1128,13 +1128,6 @@ func TestValidateV2Block(t *testing.T) {
 					txn.NewFoundationAddress = &addr
 				},
 			},
-			{
-				"revision that resolves contract",
-				func(b *types.Block) {
-					txn := &b.V2.Transactions[0]
-					txn.FileContractRevisions[0].Revision.RevisionNumber = types.MaxRevisionNumber
-				},
-			},
 			{
 				"revision with window that starts in past",
 				func(b *types.Block) {