`{#await}` blocks without `{:catch}` should also trigger `<svelte:boundary>`

[WaltzingPenguin]

Describe the problem

I have a <svelte:boundary> in my code for catching some potential issues. Inside of that is an {#await} that, since it hits the network, always has a chance to fail. I would like the display and handling of these two error conditions to be the same, but there's no good way to trigger the boundary when a promise fails.

Describe the proposed solution

I would like svelte:boundary to also catch errors in promises. Currently, this just renders blank:

<svelte:boundary>
  {#await Promise.reject()}
    Loading...
  {:then _}
     Loaded
   {/await}

  {#snippet failed()}
    An error has occurred
  {/snippet}
</svelte:boundary>

If there is a {:catch} on the block, that should not propagate up the boundary.

<svelte:boundary>
  {#await Promise.reject() then _}
    Loading...
  {:then _}
     Loaded
  {:catch}
     This error should be displayed
   {/await}

  {#snippet failed()}
    This error should not be shown
  {/snippet}
</svelte:boundary>

Importance

would make my life easier