When property changes, the fetch refires, loading appears until the fetch resolves then it displays whatever array someFetch resolved to.
I came from Vue and that plus the way Svelte does stores (literally nothing special about them) was a breath of fresh air.
<div>
{#await someFetch(property)}
<div>Loading...</div>
{:then data}
{#each data as item, index}
<div>{item}</div>
{/each}
{/await}
</div>