No null in bind:value type for input type="number"

[non25]

I know that <input type="number" /> has two value types: number | null, but svelte-check disagrees:

<script lang="ts">
  export let value: number | null = null;
</script>

<input type="number" bind:value />

<!--
Type 'number | null' is not assignable to type 'string | number | string[] | undefined'. 
Type 'null' is not assignable to type 'string | number | string[] | undefined'. 
-->

This is confusing to me, because I tend to erase inputs by setting value to null and now I'm forced to resort to undefined.

You can test it yourself with the following REPL:

<script>
    let value = 1;
</script>

<input bind:value type="number" />

<p>null: {value === null}</p>
<p>undefined: {value === undefined}</p>
<p>typeof: {typeof value}</p>

<button on:click={() => value = undefined}>undefined</button>

[dummdidumm]

Technically speaking the error is correct because you cannot set null to the input. It will be converted to an empty string by the browser. But the bind: will convert it to null.. so yeah I guess we need to relax the typings here.