Intersection

Requirements

• Implement intersection(...arrays) for zero or more arrays. Return each common value only once, in first-array encounter order.
• No input arrays returns []; one array returns its unique values; any empty array makes the intersection empty.
• Use SameValueZero equality: NaN matches NaN, 0 matches -0, and objects match only by reference. Return shared zero as positive 0. Do not coerce types.
• Sparse slots are treated as undefined. Return a new array without mutating any input, retaining object references.

Examples

Input: intersection([3, 1, 2, 2], [2, 3], [3, 2, 4])
Output: [3, 2]

Input: intersection([1, 2], [3, 4])
Output: []

Input: intersection([2, 2, 1])
Output: [2, 1]