Exception when using value object with a bigint in it (because svelte-select uses JSON.stringify on the value)

[samal-rasmussen]

REPL:
https://svelte.dev/repl/f24b4451867d45bd855d1e333ad9518f?version=4.2.18

<script>
	import Select from 'svelte-select';

	let items = [
        { value: { id: 1n, name: 'One' }, label: 'One' },
        { value: { id: 2n, name: 'Two' }, label: 'Two' },
        { value: { id: 3n, name: 'three'}, label: 'Three' },
    ];
</script>

<Select {items} clearable={false} />

Error:

TypeError: Do not know how to serialize a BigInt
    at JSON.stringify (<anonymous>)
    at Object.update [as p] (eval at handle_message (about:srcdoc:21:8), <anonymous>:4836:12)
    at Object.update [as p] (eval at handle_message (about:srcdoc:21:8), <anonymous>:5285:37)
    at update (eval at handle_message (about:srcdoc:21:8), <anonymous>:631:31)
    at flush (eval at handle_message (about:srcdoc:21:8), <anonymous>:591:6)

[samal-rasmussen]

JSON.stringify cannot be used with bigint. It's in the spec: GoogleChromeLabs/jsbi#30

There are a lot of values that don't serialize to JSON, so this will cause crashes if you take arbitrary values in from users of this lib and run them through JSON.stringify internally.