fix: await in async func throws properly

lib/values/array.ts

@@ -297,6 +297,14 @@ setProps(Array.prototype, {
     
         return -1;
     },
+    lastIndexOf(el, start) {
+        start = start! | 0;
+        for (var i = this.length; i >= start; i--) {
+            if (i in this && this[i] == el) return i;
+        }
+
+        return -1;
+    },
     includes(el, start) {
         return this.indexOf(el, start) >= 0;
     },

lib/values/function.ts

@@ -14,7 +14,7 @@ interface FunctionConstructor extends Function {
     (...args: string[]): (...args: any[]) => any;
     new (...args: string[]): (...args: any[]) => any;
     prototype: Function;
-    async<ArgsT extends any[], RetT>(func: (await: <T>(val: T) => Awaited<T>, args: ArgsT) => RetT): Promise<RetT>;
+    async<ArgsT extends any[], RetT>(func: (await: <T>(val: T) => Awaited<T>) => (...args: ArgsT) => RetT): (...args: ArgsT) => Promise<RetT>;
 }
 
 interface CallableFunction extends Function {