diff --git a/rollup.config.ts b/rollup.config.ts
index 67c2c78..f395890 100644
--- a/rollup.config.ts
+++ b/rollup.config.ts
@@ -39,6 +39,6 @@ export const createBundleConfig = (
 
 
 export default [
-    createBundleConfig("src/lib.ts", "."),
+    createBundleConfig("src/index.ts", "."),
     createBundleConfig("src/util/lib.ts", "./util"),
 ]
diff --git a/src/Trait.ts b/src/Trait.ts
index 0d836f9..4de0dc0 100644
--- a/src/Trait.ts
+++ b/src/Trait.ts
@@ -1,10 +1,12 @@
 import { Fn, Pipe, Tuples } from "hotscript"
 import { AbstractClass, Class, Opaque } from "type-fest"
-import { tag } from "type-fest/source/opaque"
 import { AbstractTag, TraitExpression, emptyTraitExpression } from "."
 import { ExtendFn, SimplifyFn, StaticMembers, StaticMembersFn } from "./util"
 
 
+export const isTraitApplierSuper = Symbol("isTraitApplierSuper")
+
+
 export type AddAbstractToImplClass<
     ImplClass extends Class<{}, []>,
     Abstract  extends {},
@@ -17,14 +19,14 @@ export type AddAbstractToImplClass<
 )
 
 export type RemoveAbstractFromImplClass<
-    ImplClassWithAbstract extends Opaque<Class<Abstract, []>, TraitApplierSuperTag>,
+    ImplClassWithAbstract extends Class<Abstract, []> & { [isTraitApplierSuper]: true },
     Abstract              extends {},
 > = (
     Class<
         Omit<InstanceType<ImplClassWithAbstract>, keyof Abstract>,
         ConstructorParameters<ImplClassWithAbstract>
     > &
-    Omit<StaticMembers<ImplClassWithAbstract>, typeof tag>
+    Omit<StaticMembers<ImplClassWithAbstract>, typeof isTraitApplierSuper>
 )
 
 
@@ -139,10 +141,10 @@ export type TraitApplierSuperTag = "@thilawyn/traitify-ts/TraitApplierSuper"
 
 export function trait<
     Abstract              extends {},
-    ImplClassWithAbstract extends Opaque<Class<Abstract, []>, TraitApplierSuperTag>,
+    ImplClassWithAbstract extends Class<Abstract, []> & { [isTraitApplierSuper]: true },
 >(
     abstract:  Opaque<Abstract, AbstractTag>,
-    apply:     (Super: Opaque<AbstractClass<Abstract>, TraitApplierSuperTag>) => ImplClassWithAbstract,
+    apply:     (Super: AbstractClass<Abstract> & { [isTraitApplierSuper]: true }) => ImplClassWithAbstract,
 ) {
     return new Trait(
         emptyTraitExpression,
diff --git a/src/TraitExpression.ts b/src/TraitExpression.ts
index cd58e47..8651ca8 100644
--- a/src/TraitExpression.ts
+++ b/src/TraitExpression.ts
@@ -1,6 +1,6 @@
 import { Call, Fn, Pipe, Tuples } from "hotscript"
 import { AbstractClass, Class, Opaque } from "type-fest"
-import { AbstractTag, RemoveAbstractFromImplClass, Trait, TraitApplierSuperTag } from "."
+import { AbstractTag, RemoveAbstractFromImplClass, Trait, TraitApplierSuperTag, isTraitApplierSuper } from "."
 import { ExtendFn, SimplifyFn, StaticMembersFn } from "./util"
 
 
@@ -53,11 +53,11 @@ export class TraitExpression<
     subtrait<
         This                          extends TraitExpression<typeof TraitExpression.NullSuperclass, any, any>,
         SubtraitAbstract              extends Implements<This>,
-        SubtraitImplClassWithAbstract extends Opaque<Class<SubtraitAbstract, []>, TraitApplierSuperTag>,
+        SubtraitImplClassWithAbstract extends Class<SubtraitAbstract, []> & { [isTraitApplierSuper]: true },
     >(
         this:      This,
         abstract:  (expression: This) => Opaque<SubtraitAbstract, AbstractTag>,
-        apply:     (Super: Opaque<AbstractClass<SubtraitAbstract>, TraitApplierSuperTag>) => SubtraitImplClassWithAbstract,
+        apply:     (Super: AbstractClass<SubtraitAbstract> & { [isTraitApplierSuper]: true }) => SubtraitImplClassWithAbstract,
     ) {
         return new Trait(
             this,
diff --git a/src/lib.ts b/src/lib.ts
index 9fc1b8f..8b575d1 100644
--- a/src/lib.ts
+++ b/src/lib.ts
@@ -5,4 +5,5 @@ export {
     trait,
     type Trait,
     type TraitExpression,
+    isTraitApplierSuper,
 } from "."