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test: give the array check in "can handle simple arrays" a matcher (#1346)

`expect(Array.isArray(c))` has no matcher, so it asserts nothing. The three
lines around it use `toEqual`, and the test is the one place that claims
`current` of an array draft is an array, so the check was meant to run.

Passes with `.toBe(true)`, and fails with `.toBe(false)`, so the assertion is
live rather than vacuous. `vitest run` is 4196 passed and 8 skipped across 25
files either way.

688 of 737 branches covered (93.35%)

Branch coverage included in aggregate %.

1769 of 4542 relevant lines covered (38.95%)

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