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Add Array.isArray improvement #23

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Fix the annoying thing where Array.isArray doesn't correctly narrow ReadonlyArray!

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import "@total-typescript/ts-reset/array-includes";
```

This rule improves on TypeScript's default `Array.isArray` behaviour. Without this rule enabled, TypeScript will not include `ReadonlyArray<Item>` when narrowing Array types.

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Also I weakly suggest using American standard spelling, though I suspect Mr. Pocock will prefer yours. ;)

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This rule improves on TypeScript's default `Array.isArray` behaviour. Without this rule enabled, TypeScript will not include `ReadonlyArray<Item>` when narrowing Array types.
This rule improves on TypeScript's default `Array.isArray` behavior. With this rule enabled, TypeScript will now include `ReadonlyArray<Item>` when narrowing Array types.

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🤓 Commonwealth power!

Co-authored-by: Tim Buckley <[email protected]>
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