diff --git a/src/ZodSchemaClass.ts b/src/ZodSchemaClass.ts
index 70d1be3..b53c7a7 100644
--- a/src/ZodSchemaClass.ts
+++ b/src/ZodSchemaClass.ts
@@ -1,5 +1,5 @@
 import { Trait, TraitExpression, TraitExpressionBuilder } from "@thilawyn/traitify-ts"
-import { AbstractClass, IsEqual } from "type-fest"
+import { AbstractClass } from "type-fest"
 import { JsonifiableObject } from "type-fest/source/jsonifiable"
 import { z } from "zod"
 import { ZodSchemaAbstractClass } from "./shapes/ZodSchemaClass"
@@ -10,43 +10,13 @@ import { JsonifiableZodSchemaObject } from "./traits/JsonifiableZodSchemaObject"
 import { StaticMembers } from "./util"
 
 
-type SpreadSupertraits<Traits> = (
-    Traits extends [
-        infer El extends Trait<any, any, any, any>,
-        ...infer Rest,
-    ]
-        ? [
-            ...Trait.Supertraits<El>,
-            El,
-            ...SpreadSupertraits<Rest>,
-        ]
-        : []
-)
-
-type TraitsUniq<Traits> = (
-    Traits extends [
-        ...infer Rest,
-        infer El extends Trait<any, any, any, any>,
-    ]
-        ? IsTraitInTupleFromRight<Rest, El> extends true
-            ? TraitsUniq<Rest>
-            : [...TraitsUniq<Rest>, El]
-        : []
-)
-type IsTraitInTupleFromRight<Traits, T> = (
-    Traits extends [...infer Rest, infer El]
-        ? IsEqual<El, T> extends true
-            ? true
-            : IsTraitInTupleFromRight<Rest, T>
-        : false
-)
-
-
 export class ZodSchemaClassBuilder<
     Superclass   extends AbstractClass<object>,
-    const Traits extends Trait<any, any, any, any>[],
+    const Traits extends readonly Trait<any, any, any, any>[],
 >
 extends TraitExpressionBuilder<Superclass, Traits> {
+    declare ["constructor"]: typeof ZodSchemaClassBuilder
+
     extends<
         Super extends AbstractClass<object>
     >(
@@ -54,31 +24,12 @@ extends TraitExpressionBuilder<Superclass, Traits> {
         this:        ZodSchemaClassBuilder<typeof TraitExpression.NullSuperclass, Traits>,
         superclass:  Super,
     ) {
-        return new ZodSchemaClassBuilder(
+        return new this.constructor(
             superclass,
             this.expressionTraits,
         )
     }
 
-    expresses<
-        const T extends Trait<
-            TraitExpression<
-                typeof TraitExpression.NullSuperclass,
-                Trait<any, any, any, any>[]
-            >,
-            any,
-            any,
-            any
-        >[]
-    >(
-        ...traits: T
-    ): TraitExpressionBuilder<
-        Superclass,
-        TraitsUniq<[...Traits, ...SpreadSupertraits<T>]>
-    > {
-        return super.expresses(...traits)
-    }
-
     schema<
         Superclass        extends AbstractClass<object, []> & { schema?: never, defaultValues?: never },
 
@@ -106,7 +57,7 @@ extends TraitExpressionBuilder<Superclass, Traits> {
             }
         }
 
-        return new ZodSchemaClassBuilder(
+        return new this.constructor(
             Schemas as unknown as (
                 AbstractClass<
                     InstanceType<Superclass> & Values,
@@ -171,7 +122,7 @@ extends TraitExpressionBuilder<Superclass, Traits> {
                    readonly dejsonifySchema = dejsonifySchema
         }
 
-        return new ZodSchemaClassBuilder(
+        return new this.constructor(
             JsonifiableSchemas as unknown as (
                 AbstractClass<
                     InstanceType<Superclass> & JsonifiableSchemas,
@@ -191,3 +142,25 @@ extends TraitExpressionBuilder<Superclass, Traits> {
         )
     }
 }
+
+export interface ZodSchemaClassBuilder<
+    Superclass extends AbstractClass<object>,
+    Traits     extends readonly Trait<any, any, any, any>[],
+> {
+    expresses<
+        const T extends readonly Trait<
+            TraitExpression<
+                typeof TraitExpression.NullSuperclass,
+                readonly Trait<any, any, any, any>[]
+            >,
+            any,
+            any,
+            any
+        >[]
+    >(
+        ...traits: T
+    ): ZodSchemaClassBuilder<
+        Superclass,
+        TraitExpressionBuilder.ExpressesReturnTypeTraits<Traits, T>
+    >
+}