array_duplicate_by() helper to get duplicate array by column

A new Array helper has been proposed. 
See https://github.com/codeigniter4/CodeIgniter4/pull/8436

It returns duplicate elements in an array by key(s):

PHP Code:

$duplicate = array_duplicate_by($key, $data); 


Do you think CI4 should have the function, or you don't need it?

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I've never had to look for duplicates

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I say No, it would be a method that would be hardly used and would add bloat to CI..

What did you Try? What did you Get? What did you Expect?

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I only use array_unique to remove values from an array, I have no need to find which keys are duplicates.

Will be use for upload batch by excel, I made this so that when uploading master data like hospital or member it immediately rejects duplication. This function returning duplication data for make excel again. Its not important, I just share my function in real case. It all depends on whether the final results of the voting are useful for other people