Keep valid zero values with nullish coalescing
Use the nullish coalescing operator when only null or undefined should trigger a default.
Logical OR treats 0, false, and an empty string as missing. Nullish coalescing only uses the fallback for null or undefined:
const pageSize = requestedPageSize ?? 20;
If requestedPageSize is 0, the value remains 0. Validate whether zero is allowed separately from choosing a default.
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