Function shallowEqual

shallowEqual<T>(a: T, b: T): boolean
One-level structural equality predicate.
Type Parameters
- T
  The compared value type.
Parameters
- a: T
  First value to compare.
- b: T
  Second value to compare.
Returns boolean
true when the values are Object.is-equal, or are arrays of equal length whose indices are pairwise Object.is-equal, or are plain objects with the same own-key set whose values are pairwise Object.is-equal; otherwise false.
Remarks
The predicate is intentionally one level deep — nested objects are compared by reference. That matches the dedup contract: callers who need deeper structural equality should pre-normalise inside the selector or memoise the deeper structures elsewhere.
Example
```
shallowEqual({ a: 1, b: 2 }, { a: 1, b: 2 }) // true
shallowEqual([1, 2, 3], [1, 2, 3])           // true
shallowEqual({ a: { x: 1 } }, { a: { x: 1 } }) // false (nested ref differs)
```
- Defined in useCauslShallow.ts:141