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## Summary
- Add `_idleStart` property (getter/setter) to the Timeout object
returned by `setTimeout()` and `setInterval()`
- The property returns a monotonic timestamp (in milliseconds)
representing when the timer was created
- This mimics Node.js's behavior where `_idleStart` is the libuv
timestamp at timer creation time
## Test plan
- [x] Verified test fails with `USE_SYSTEM_BUN=1 bun test
test/regression/issue/25639.test.ts`
- [x] Verified test passes with `bun bd test
test/regression/issue/25639.test.ts`
- [x] Manual verification:
```bash
# Bun with fix - _idleStart exists
./build/debug/bun-debug -e "const t = setTimeout(() => {}, 0);
console.log('_idleStart' in t, typeof t._idleStart); clearTimeout(t)"
# Output: true number
# Node.js reference - same behavior
node -e "const t = setTimeout(() => {}, 0); console.log('_idleStart' in
t, typeof t._idleStart); clearTimeout(t)"
# Output: true number
```
Closes #25639
🤖 Generated with [Claude Code](https://claude.com/claude-code)
---------
Co-authored-by: Claude Bot <claude-bot@bun.sh>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>