diff --git a/src/builders/ZodSchemaClassExtender.ts b/src/builders/ZodSchemaClassExtender.ts
index b545638..5ba03b9 100644
--- a/src/builders/ZodSchemaClassExtender.ts
+++ b/src/builders/ZodSchemaClassExtender.ts
@@ -1,7 +1,10 @@
+import { expression } from "@thilawyn/traitify-ts"
 import { AbstractClass, Simplify } from "type-fest"
 import { z } from "zod"
 import { ZodSchemaAbstractClass } from "../shapes/ZodSchemaClass"
 import { Extend, Override, StaticMembers } from "../util"
+import { JsonifiableZodSchemaAbstractClass, JsonifiableZodSchemaClass } from "../shapes/JsonifiableZodSchemaClass"
+import { JsonifiableObject } from "type-fest/source/jsonifiable"
 
 
 export class ZodSchemaClassExtender<Superclass extends AbstractClass<object>> {
@@ -63,30 +66,58 @@ export class ZodSchemaClassExtender<Superclass extends AbstractClass<object>> {
     }
 
     jsonifiable<
-        Super                  extends ZodSchemaAbstractClass<SuperInstance, SuperSchemaT, SuperSchemaUnknownKeys, SuperSchemaCatchall, SuperValues, SuperDefaultValues>,
-        SuperInstance          extends SuperValues,
+        Super                      extends JsonifiableZodSchemaAbstractClass<
+            Instance,
 
-        SuperSchemaT           extends z.ZodRawShape,
-        SuperSchemaUnknownKeys extends z.UnknownKeysParam,
-        SuperSchemaCatchall    extends z.ZodTypeAny,
+            JsonifySchemaT,
+            JsonifySchemaUnknownKeys,
+            JsonifySchemaCatchall,
 
-        SuperValues            extends object,
-        SuperDefaultValues     extends Partial<SuperValues>,
+            DejsonifySchemaT,
+            DejsonifySchemaUnknownKeys,
+            DejsonifySchemaCatchall,
 
-        SchemaT                extends z.ZodRawShape,
-        SchemaUnknownKeys      extends z.UnknownKeysParam,
-        SchemaCatchall         extends z.ZodTypeAny,
+            JsonifiedValues,
+            Values
+        >,
+        Instance                   extends Values,
 
-        Values                 extends SuperValues,
-        DefaultValues          extends Partial<Values>,
+        JsonifySchemaT             extends z.ZodRawShape,
+        JsonifySchemaUnknownKeys   extends z.UnknownKeysParam,
+        JsonifySchemaCatchall      extends z.ZodTypeAny,
+
+        DejsonifySchemaT           extends z.ZodRawShape,
+        DejsonifySchemaUnknownKeys extends z.UnknownKeysParam,
+        DejsonifySchemaCatchall    extends z.ZodTypeAny,
+
+        JsonifiedValues            extends JsonifiableObject,
+        Values                     extends object,
     >(
         this: ZodSchemaClassExtender<
-            Super | ZodSchemaAbstractClass<SuperInstance, SuperSchemaT, SuperSchemaUnknownKeys, SuperSchemaCatchall, SuperValues, SuperDefaultValues>
+            Super | JsonifiableZodSchemaAbstractClass<
+                Instance,
+
+                JsonifySchemaT,
+                JsonifySchemaUnknownKeys,
+                JsonifySchemaCatchall,
+
+                DejsonifySchemaT,
+                DejsonifySchemaUnknownKeys,
+                DejsonifySchemaCatchall,
+
+                JsonifiedValues,
+                Values
+            >
         >,
 
         props: {
-            schema:         (schema: Super["schema"]) => z.ZodObject<SchemaT, SchemaUnknownKeys, SchemaCatchall, Values, Values>
-            defaultValues:  (defaultValues: SuperDefaultValues) => DefaultValues
+            jsonifySchema: (
+                schema: z.ZodObject<SchemaT, SchemaUnknownKeys, SchemaCatchall, Values, Values>
+            ) => z.ZodObject<JsonifySchemaT, JsonifySchemaUnknownKeys, JsonifySchemaCatchall, JsonifiedValues, Values>
+
+            dejsonifySchema: (
+                schema: z.ZodObject<SchemaT, SchemaUnknownKeys, SchemaCatchall, Values, Values>
+            ) => z.ZodObject<DejsonifySchemaT, DejsonifySchemaUnknownKeys, DejsonifySchemaCatchall, Values, JsonifiedValues>
         },
     ) {
         const schema        = props.schema(this.superclass.schema)
@@ -115,7 +146,11 @@ export class ZodSchemaClassExtender<Superclass extends AbstractClass<object>> {
     }
 
 
-    build() {
+    toClass() {
         return this.superclass
     }
+
+    toExpressionBuilder() {
+        return expression.extends(this.superclass)
+    }
 }
diff --git a/src/tests.ts b/src/tests.ts
index 103f99c..fe55b25 100644
--- a/src/tests.ts
+++ b/src/tests.ts
@@ -48,7 +48,7 @@ const AdminUserProto = User.extend()
     })
 
 
-class AdminUser extends AdminUserProto.build() {}
+class AdminUser extends AdminUserProto.toClass() {}
 const subInst = await AdminUser.createPromise({ id: 2n, prout: "" })
 console.log(subInst)