fix wrapping object with null prototype

Author: MrFoxPro

packages/solid/store/src/mutable.ts

@@ -97,6 +97,7 @@ function wrap<T extends StoreNode>(value: T): T {
 
     const proto = Object.getPrototypeOf(value);
     const isClass =
+      proto !== null &&
       value !== null &&
       typeof value === "object" &&
       !Array.isArray(value) &&

packages/solid/store/test/mutable.spec.ts

@@ -2,6 +2,11 @@ import { createRoot, createSignal, createMemo, batch, createEffect } from "../..
 import { Accessor, Setter } from "../../types";
 import { createMutable, unwrap, $RAW } from "../src";
 
+test("Object.create(null) is allowed", () => {
+  const user = createMutable(Object.assign(Object.create(null), { name: "John" }));
+  expect(user.name).toBe("John");
+});
+
 describe("State Mutability", () => {
   test("Setting a property", () => {
     const user = createMutable({ name: "John" });