diff --git a/src/prelude/list.ts b/src/prelude/list.ts
index 0c7d7be..86320e0 100644
--- a/src/prelude/list.ts
+++ b/src/prelude/list.ts
@@ -1,7 +1,7 @@
 import { type Value, toValue, toNull } from 'reefvm'
 
 export const list = {
-  slice: (list: any[], start: number, end?: number) => list.slice(start, end),
+  slice: (list: any[], start: number, end?: number) => list.slice(start, end ? end : undefined),
   map: async (list: any[], cb: Function) => {
     let acc: any[] = []
     for (const value of list) acc.push(await cb(value))
@@ -70,8 +70,7 @@ export const list = {
     const realList = list.value as any[]
     const realStart = start.value as number
     const realDeleteCount = deleteCount.value as number
-    const realItems = items.map(item => item.value)
-    return toValue(realList.splice(realStart, realDeleteCount, ...realItems))
+    return toValue(realList.splice(realStart, realDeleteCount, ...items))
   },
   insert: (list: Value, index: Value, item: Value) => {
     if (list.type !== 'array') return toNull()