Elevator `??` design

I scanned the elevator MegaProtoUser and faced with this design: ??("Last Name"). Can someone explain what this means?
Thanks for answering

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It is determined on the object S:

def ??(str : String)

Get the localized row of the main elevator or return the original row [details]

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Source: https://habr.com/ru/post/1741619/


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