AsyncQueuer silently drops falsy queue items (0, "", false, null)

[simonmeyerrr]

TanStack Pacer version

@tanstack/pacer 0.20.1 (current latest)

Framework/Library version

Node 24

Describe the bug and the steps to reproduce it

AsyncQueuer silently drops falsy queue items. Values like 0, "", false, and null are accepted into the queue via addItem(), but they are never processed by the #tick() loop.

Root Cause

In packages/pacer/src/async-queuer.ts, the #tick() method uses a falsy check when peeking at the next item:

const nextItem = this.peekNextItem()
if (!nextItem) {
  break
}

Your Minimal, Reproducible Example - (Sandbox Highly Recommended)

https://stackblitz.com/edit/stackblitz-starters-uqnwpqze?file=index.js

Screenshots or Videos (Optional)

No response

Do you intend to try to help solve this bug with your own PR?

Yes, I am also opening a PR that solves the problem along side this issue

Terms & Code of Conduct

• I agree to follow this project's Code of Conduct
• I understand that if my bug cannot be reliable reproduced in a debuggable environment, it will probably not be fixed and this issue may even be closed.