[ListBox] Undefined behaviour when 0 is passed as selection value

[bugproof]

Current Behavior

This might be expected or not. At least it should be mentioned in the docs. If you try to use enum value it naturally starts from 0 so this might not be expected.

Steps To Reproduce

const storeSingle: Writable<number> = writable(0);

<ListBox selected="{storeSingle}" label="Single Selection">
	<ListBoxItem value={0}>Selection Example 1</ListBoxItem>
	<ListBoxItem value={1}>Selection Example 2</ListBoxItem>
</ListBox>

Anything else?

Personally if #845 is fixed then I wouldn't have this issue.

[endigo9740]

Included this with #845 so I'm closing this out. We'll address both issues at once time so it's simpler if they're in one place. Thanks for reporting!