diff --git a/go/src/v.io/x/js.core/stress/stress.vdl.go b/go/src/v.io/x/js.core/stress/stress.vdl.go
index 6a6c3b5..3b8eecd 100644
--- a/go/src/v.io/x/js.core/stress/stress.vdl.go
+++ b/go/src/v.io/x/js.core/stress/stress.vdl.go
@@ -41,49 +41,40 @@
 		return err
 	}
 
-	var2 := (m.Iterations == int64(0))
-	if !var2 {
-		keyTarget3, fieldTarget4, err := fieldsTarget1.StartField("Iterations")
-		if err != vdl.ErrFieldNoExist && err != nil {
+	keyTarget2, fieldTarget3, err := fieldsTarget1.StartField("Iterations")
+	if err != vdl.ErrFieldNoExist && err != nil {
+		return err
+	}
+	if err != vdl.ErrFieldNoExist {
+		if err := fieldTarget3.FromInt(int64(m.Iterations), vdl.Int64Type); err != nil {
 			return err
 		}
-		if err != vdl.ErrFieldNoExist {
-			if err := fieldTarget4.FromInt(int64(m.Iterations), vdl.Int64Type); err != nil {
-				return err
-			}
-			if err := fieldsTarget1.FinishField(keyTarget3, fieldTarget4); err != nil {
-				return err
-			}
+		if err := fieldsTarget1.FinishField(keyTarget2, fieldTarget3); err != nil {
+			return err
 		}
 	}
-	var5 := (m.Qps == float64(0))
-	if !var5 {
-		keyTarget6, fieldTarget7, err := fieldsTarget1.StartField("Qps")
-		if err != vdl.ErrFieldNoExist && err != nil {
+	keyTarget4, fieldTarget5, err := fieldsTarget1.StartField("Qps")
+	if err != vdl.ErrFieldNoExist && err != nil {
+		return err
+	}
+	if err != vdl.ErrFieldNoExist {
+		if err := fieldTarget5.FromFloat(float64(m.Qps), vdl.Float64Type); err != nil {
 			return err
 		}
-		if err != vdl.ErrFieldNoExist {
-			if err := fieldTarget7.FromFloat(float64(m.Qps), vdl.Float64Type); err != nil {
-				return err
-			}
-			if err := fieldsTarget1.FinishField(keyTarget6, fieldTarget7); err != nil {
-				return err
-			}
+		if err := fieldsTarget1.FinishField(keyTarget4, fieldTarget5); err != nil {
+			return err
 		}
 	}
-	var8 := (m.MsecsPerRpc == float64(0))
-	if !var8 {
-		keyTarget9, fieldTarget10, err := fieldsTarget1.StartField("MsecsPerRpc")
-		if err != vdl.ErrFieldNoExist && err != nil {
+	keyTarget6, fieldTarget7, err := fieldsTarget1.StartField("MsecsPerRpc")
+	if err != vdl.ErrFieldNoExist && err != nil {
+		return err
+	}
+	if err != vdl.ErrFieldNoExist {
+		if err := fieldTarget7.FromFloat(float64(m.MsecsPerRpc), vdl.Float64Type); err != nil {
 			return err
 		}
-		if err != vdl.ErrFieldNoExist {
-			if err := fieldTarget10.FromFloat(float64(m.MsecsPerRpc), vdl.Float64Type); err != nil {
-				return err
-			}
-			if err := fieldsTarget1.FinishField(keyTarget9, fieldTarget10); err != nil {
-				return err
-			}
+		if err := fieldsTarget1.FinishField(keyTarget6, fieldTarget7); err != nil {
+			return err
 		}
 	}
 	if err := t.FinishFields(fieldsTarget1); err != nil {
@@ -96,12 +87,6 @@
 	return nil
 }
 
-func (m *StressResults) IsZero() bool {
-
-	var1 := (*m == StressResults{})
-	return var1
-}
-
 func init() {
 	vdl.Register((*StressResults)(nil))
 }
diff --git a/go/src/v.io/x/js.core/test_service/cache.vdl.go b/go/src/v.io/x/js.core/test_service/cache.vdl.go
index 95292ce..1eb5246 100644
--- a/go/src/v.io/x/js.core/test_service/cache.vdl.go
+++ b/go/src/v.io/x/js.core/test_service/cache.vdl.go
@@ -53,12 +53,6 @@
 	return nil
 }
 
-func (m KeyPageResult) IsZero() bool {
-
-	var1 := (m == KeyPageResult{})
-	return var1
-}
-
 // KeyValuePair is a representation of a cached key and value pair.
 type KeyValuePair struct {
 	Key   string
@@ -80,41 +74,35 @@
 		return err
 	}
 
-	var2 := (m.Key == "")
-	if !var2 {
-		keyTarget3, fieldTarget4, err := fieldsTarget1.StartField("Key")
-		if err != vdl.ErrFieldNoExist && err != nil {
+	keyTarget2, fieldTarget3, err := fieldsTarget1.StartField("Key")
+	if err != vdl.ErrFieldNoExist && err != nil {
+		return err
+	}
+	if err != vdl.ErrFieldNoExist {
+		if err := fieldTarget3.FromString(string(m.Key), vdl.StringType); err != nil {
 			return err
 		}
-		if err != vdl.ErrFieldNoExist {
-			if err := fieldTarget4.FromString(string(m.Key), vdl.StringType); err != nil {
-				return err
-			}
-			if err := fieldsTarget1.FinishField(keyTarget3, fieldTarget4); err != nil {
-				return err
-			}
+		if err := fieldsTarget1.FinishField(keyTarget2, fieldTarget3); err != nil {
+			return err
 		}
 	}
-	var5 := (m.Value == (*vom.RawBytes)(nil))
-	if !var5 {
-		keyTarget6, fieldTarget7, err := fieldsTarget1.StartField("Value")
-		if err != vdl.ErrFieldNoExist && err != nil {
-			return err
-		}
-		if err != vdl.ErrFieldNoExist {
+	keyTarget4, fieldTarget5, err := fieldsTarget1.StartField("Value")
+	if err != vdl.ErrFieldNoExist && err != nil {
+		return err
+	}
+	if err != vdl.ErrFieldNoExist {
 
-			if m.Value == nil {
-				if err := fieldTarget7.FromNil(vdl.AnyType); err != nil {
-					return err
-				}
-			} else {
-				if err := m.Value.FillVDLTarget(fieldTarget7, vdl.AnyType); err != nil {
-					return err
-				}
-			}
-			if err := fieldsTarget1.FinishField(keyTarget6, fieldTarget7); err != nil {
+		if m.Value == nil {
+			if err := fieldTarget5.FromNil(vdl.AnyType); err != nil {
 				return err
 			}
+		} else {
+			if err := m.Value.FillVDLTarget(fieldTarget5, vdl.AnyType); err != nil {
+				return err
+			}
+		}
+		if err := fieldsTarget1.FinishField(keyTarget4, fieldTarget5); err != nil {
+			return err
 		}
 	}
 	if err := t.FinishFields(fieldsTarget1); err != nil {
@@ -127,12 +115,6 @@
 	return nil
 }
 
-func (m *KeyValuePair) IsZero() bool {
-
-	var1 := (*m == KeyValuePair{})
-	return var1
-}
-
 func init() {
 	vdl.Register((*KeyPageResult)(nil))
 	vdl.Register((*KeyValuePair)(nil))
diff --git a/go/src/v.io/x/js.core/test_service/invoke_method_caveat_id.vdl.go b/go/src/v.io/x/js.core/test_service/invoke_method_caveat_id.vdl.go
index 9ce4033..85e4079 100644
--- a/go/src/v.io/x/js.core/test_service/invoke_method_caveat_id.vdl.go
+++ b/go/src/v.io/x/js.core/test_service/invoke_method_caveat_id.vdl.go
@@ -40,41 +40,35 @@
 		return err
 	}
 
-	var2 := (m.A == "")
-	if !var2 {
-		keyTarget3, fieldTarget4, err := fieldsTarget1.StartField("A")
-		if err != vdl.ErrFieldNoExist && err != nil {
+	keyTarget2, fieldTarget3, err := fieldsTarget1.StartField("A")
+	if err != vdl.ErrFieldNoExist && err != nil {
+		return err
+	}
+	if err != vdl.ErrFieldNoExist {
+		if err := fieldTarget3.FromString(string(m.A), vdl.StringType); err != nil {
 			return err
 		}
-		if err != vdl.ErrFieldNoExist {
-			if err := fieldTarget4.FromString(string(m.A), vdl.StringType); err != nil {
-				return err
-			}
-			if err := fieldsTarget1.FinishField(keyTarget3, fieldTarget4); err != nil {
-				return err
-			}
+		if err := fieldsTarget1.FinishField(keyTarget2, fieldTarget3); err != nil {
+			return err
 		}
 	}
-	var5 := (m.B == (*vom.RawBytes)(nil))
-	if !var5 {
-		keyTarget6, fieldTarget7, err := fieldsTarget1.StartField("B")
-		if err != vdl.ErrFieldNoExist && err != nil {
-			return err
-		}
-		if err != vdl.ErrFieldNoExist {
+	keyTarget4, fieldTarget5, err := fieldsTarget1.StartField("B")
+	if err != vdl.ErrFieldNoExist && err != nil {
+		return err
+	}
+	if err != vdl.ErrFieldNoExist {
 
-			if m.B == nil {
-				if err := fieldTarget7.FromNil(vdl.AnyType); err != nil {
-					return err
-				}
-			} else {
-				if err := m.B.FillVDLTarget(fieldTarget7, vdl.AnyType); err != nil {
-					return err
-				}
-			}
-			if err := fieldsTarget1.FinishField(keyTarget6, fieldTarget7); err != nil {
+		if m.B == nil {
+			if err := fieldTarget5.FromNil(vdl.AnyType); err != nil {
 				return err
 			}
+		} else {
+			if err := m.B.FillVDLTarget(fieldTarget5, vdl.AnyType); err != nil {
+				return err
+			}
+		}
+		if err := fieldsTarget1.FinishField(keyTarget4, fieldTarget5); err != nil {
+			return err
 		}
 	}
 	if err := t.FinishFields(fieldsTarget1); err != nil {
@@ -87,12 +81,6 @@
 	return nil
 }
 
-func (m *TestCaveatData) IsZero() bool {
-
-	var1 := (*m == TestCaveatData{})
-	return var1
-}
-
 func init() {
 	vdl.Register((*TestCaveatData)(nil))
 }