diff --git a/src/tests.ts b/src/tests.ts
index a27d87d..0e88cba 100644
--- a/src/tests.ts
+++ b/src/tests.ts
@@ -27,8 +27,11 @@ class User extends mixTraits(
     }
 }
 
+console.log(Permissible.constructor())
+// console.log(Object.getOwnPropertyNames(User.prototype))
+
 const user1 = new User(BigInt(1))
 const user2 = new User(BigInt(2))
 
-console.log(user1.equals(user2))
-console.log(user1.permissions)
+// console.log(user1.equals(user2))
+// console.log(user1.permissions)
diff --git a/src/util/class.ts b/src/util/class.ts
index 671ff45..aecd83d 100644
--- a/src/util/class.ts
+++ b/src/util/class.ts
@@ -21,7 +21,10 @@ export function copyClassProperties(
     to:    AbstractClass<any, any>,
 ) {
     Object.getOwnPropertyNames(from).forEach(name => {
-        if (name === "length"
+        // console.log(from, to, name, Object.getOwnPropertyDescriptor(from, name))
+
+        if (name === "name"
+         || name === "length"
          || name === "prototype"
         )
             return
@@ -34,6 +37,11 @@ export function copyClassProperties(
     })
 
     Object.getOwnPropertyNames(from.prototype).forEach(name => {
+        // console.log(from, to, name, Object.getOwnPropertyDescriptor(from, name))
+
+        if (name === "constructor")
+            return
+
         Object.defineProperty(
             to.prototype,
             name,