OptionalarrayStrategy for merging arrays.
'replace' (default): the second array fully replaces the first.'concat': arrays are concatenated (second appended to first).OptionalmaxMaximum recursion depth before bailing out (default: 50).
Beyond this depth, the second value overwrites the first without further
recursion, preventing stack overflows on deeply nested or malicious input.
Options for objectDeepMerge.withOptions.