chomp doesn't change the array because there is no newline in the array. split returns what's separated by the separator.

 +------------------> $arr1[0] = "aaa";
 |    +-------------> $arr1[1] = "bbb"; 
 |    |    +--------> $arr1[2] = "ccc";
 |    |    |   +----> empty field dropped
 |    |    |   |
---  ---  ---  -
aaa\nbbb\nccc\n
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