Fix Watcher

[abdel-17]

This PR fixes a minor bug with watchers that receive an array getter.

watch(
    () => [1, 2, 3],
    (value, previous) => {
        // ^ number[] | undefined
        // but this is actually an array of undefined values.
    },
)

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Latest commit: 4ff4f7155f41624f820303824d9f827f076ab64d

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[abdel-17]

If #48 gets merged, we won't need this.