This PR updates code in packages that target Node.js 18+ to take advantage of two ES2022 features that have been supported since Node.js 16:

• Array.prototype.at()
• Object.hasOwn()

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• It's really useful if your PR references an issue where it is discussed ahead of time. If the feature is substantial or introduces breaking changes without a discussion, PR might be closed.
• Ideally, include a test that fails without this PR but passes with it.
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Tests

• Run the tests with pnpm test:ci. (Author's note: On my Mac, several tests fail on both main and this PR branch.)

Documentation

• If you introduce new functionality, document it. You can run documentation with pnpm run docs command.

Changesets

• Changes in changelog are generated from PR name. Please, make sure that it explains your changes in an understandable manner. Please, prefix changeset messages with feat:, fix:, perf:, docs:, or chore:.