Undefined renders NaN

[flappyBug]

NumberFlow version

@number-flow/react@0.4.2

Framework version

react@18.3.1

Describe the bug and the steps to reproduce it

<NumberFlow value={undefined} /> renders as NaN. It better renders as empty.

Minimal reproduction (greatly appreciated)

No response

[barvian]

Hi, thanks for filing. I don't have a strong feeling about this, but I like being consistent with Intl.NumberFormat which currently returns NaN for undefined. I'll convert this to a discussion though, in case other people want to chime in 👋