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-This function is an improvement over the == operator, because
it can handle any data type in any combination.
-For arrays, it returns true if all arrays hold the same elements in the same order.
-If all values are undefined / nil / null, then this function will return true.
-Warning: Extremely large strings (>4k) or compiled code (from a file, for example) might not be properly compared, if they are only different near the end of the file.