serveStatic's fallthrough option does not function as intended (possible fix included)

[OmarMAttia7]

Environment

• pnpm 9.10.0
• NodeJS 20.16.0

Reproduction

import { createApp, defineEventHandler, serveStatic } from "h3";
import { readFile, stat } from "fs/promises";
import { join } from "path";

export const app = createApp();

const publicDir = "public";

app.use(
  "/",
  defineEventHandler(async (event) => {
    return await serveStatic(event, {
      getContents: async (id) => await readFile(join(publicDir, id)),
      getMeta: async (id) => {
        const stats = await stat(join(publicDir, id)).catch(() => undefined);

        if (!stats || !stats.isFile()) {
          return;
        }

        return {
          size: stats.size,
          mtime: stats.mtime,
        };
      },
      fallthrough: true,
    });
  })
);

app.use(
  "/",
  defineEventHandler((event) => {
    return "Hello world";
  })
);

Describe the bug

Adding fallthrough: true option to serveStatic does not pass the request to the next event handler/middleware and returns false which h3 interprets as json.

I think I identified the offending code in src/utils/static.ts, removing it fixes the problem but I don't know if it breaks anything else yet.
on line 24: return false should be return or return undefined
same thing on line 65

Refer to the registering event handlers section in the app instance docs.

I can submit a PR with a test and the fix if needed.

Additional context

No response

Logs

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