diff --git a/src/util/extend.ts b/src/util/extend.ts
index 3269bab..b8f2e95 100644
--- a/src/util/extend.ts
+++ b/src/util/extend.ts
@@ -11,6 +11,14 @@ import { CommonKeys } from "."
 // }
 // export type ExtendFn = Tuples.Reduce<ExtendReducerFn, {}>
 
+// export type ExtendableFn = ComposeLeft<[
+//     ExtendFn,
+//     Match<[
+//         Match.With<never, false>,
+//         Match.With<any, true>,
+//     ]>
+// ]>
+
 
 export type Extend<T extends readonly object[]> = (
     T extends [infer Super, infer Self, ...infer Rest]
@@ -28,12 +36,3 @@ export type Extend<T extends readonly object[]> = (
                 : never
             : {}
 )
-
-
-// export type ExtendableFn = ComposeLeft<[
-//     ExtendFn,
-//     Match<[
-//         Match.With<never, false>,
-//         Match.With<any, true>,
-//     ]>
-// ]>