Find the maximum integer value in a list of integers. Return null if the list is null or empty.

Examples:

Input: numbers = [1, 5, 3, 9, 2] Output: 9 Explanation: The maximum value in the list is 9 Input: numbers = [-10, -5, -20, -1] Output: -1 Explanation: The maximum value among negative numbers is -1 Input: numbers = [] Output: null Explanation: Empty list returns null
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