In Svelte >=3.6.9, when a writableDerived is set by its own subscribers, reflect does not receive the latest value

[PixievoltNo1]

Given code like this:

var store = writableDerived(writable(), () => 1, (reflecting) => {
	console.log(reflecting);
});
store.subscribe( (value) => {
	if (value.slice(-2) != "ho") {
		store.set(value + "ho");
	}
} );
store.set("hi");

You'll see "hi", not "hiho", logged to the console. This seems to be true for every Svelte version since 3.6.9, and every svelte-writable-derived version since 2.0.0. It appears to have been introduced by Svelte's fix for sveltejs/svelte#3191, so I don't think it's reasonable to ask Svelte to revert. This should get fixed on svelte-writable-derived's end, which may involve setting the minimum Svelte peerDependency version to 3.6.9.

(Incidentally, it should've been impossible to publish versions 2.1.0 and 2.1.1 with this bug. The test suite should've run using later Svelte versions, detected this problem, and prevented npm publish from proceeding. I have no idea what part of this process didn't work as advertised, but after recent changes I've verified it'll work in the future.)

[PixievoltNo1]

Fix released in version 2.1.2.