X rebuild: tests: Don't reflect.DeepEqual in inner loop

154s -> 130s

wcfs/internal/xbtree/δbtail.go

@@ -184,6 +184,7 @@ func (orig *ΔBtail) Clone() *ΔBtail {
 	}
 
 	// vδBroots
+	klon.vδBroots = make([]ΔBroots, 0, len(orig.vδBroots))
 	for _, origδBroots := range orig.vδBroots {
 		klonδBroots := ΔBroots{
 			Rev:    origδBroots.Rev,
@@ -208,6 +209,7 @@ func (orig *ΔBtail) Clone() *ΔBtail {
 // Clone returns copy of ΔTtail.
 func (orig *ΔTtail) Clone() *ΔTtail {
 	klon := &ΔTtail{}
+	klon.vδT = make([]ΔTree, 0, len(orig.vδT))
 	for _, origδT := range orig.vδT {
 		klonδT := ΔTree{
 			Rev: origδT.Rev,

wcfs/internal/xbtree/δbtail_test.go

@@ -1148,7 +1148,7 @@ func xverifyΔBTail_rebuild_U(t *testing.T, δbtail *ΔBtail, treeRoot zodb.Oid,
 	if len(δB.ΔByRoot) != δrootsOK {
 		t.Errorf("%s: len(δB.ΔByRoot) != %d  ; δroots=%v", subj, δrootsOK, δroots)
 	}
-	if !reflect.DeepEqual(δT, δTok) {
+	if !δTEqual(δT, δTok) {
 		t.Errorf("%s: δB.ΔBByRoot[%s]:\nhave: %v\nwant: %v", subj, treeRoot, δT, δTok)
 	}
 }
@@ -1210,7 +1210,7 @@ func assertΔTtail(t *testing.T, subj string, δbtail *ΔBtail, tj *tTreeCommit,
 		atPrev = δToid.Rev
 	}
 
-	if !(reflect.DeepEqual(vat, vatOK) && reflect.DeepEqual(vδT, vδTok)) {
+	if !(tidvEqual(vat, vatOK) && vδTEqual(vδT, vδTok)) {
 		have := ""
 		for i := 0; i<len(vδT); i++ {
 			have += fmt.Sprintf("\n\t@%s: %v", xat[vat[i]], vδT[i])
@@ -2065,6 +2065,43 @@ func (b *RBucket) String() string {
 
 }
 
+// XXX place
+func tidvEqual(av, bv []zodb.Tid) bool {
+	if len(av) != len(bv) {
+		return false
+	}
+	for i, a := range av {
+		if bv[i] != a {
+			return false
+		}
+	}
+	return true
+}
+
+func vδTEqual(vδa, vδb []map[Key]Δstring) bool {
+	if len(vδa) != len(vδb) {
+		return false
+	}
+	for i, δa := range vδa {
+		if !δTEqual(δa, vδb[i]) {
+			return false
+		}
+	}
+	return true
+}
+
+func δTEqual(δa, δb map[Key]Δstring) bool {
+	if len(δa) != len(δb) {
+		return false
+	}
+	for k, δ := range δa {
+		δ_, ok := δb[k]
+		if !ok || δ != δ_ {
+			return false
+		}
+	}
+	return true
+}
 
 // ----------------------------------------