At one time .threads was keyed entirely on the U_Username field, which meant that a user could never change displayed name, would have to reregister to use a new name, would have multiple acocunts with the same email..... etc.
In version 6.2 we made the switch to using userid, though there were some legacy pieces that still used U_Username. THe new product will not have legacy code to deal with, it will all be keyed on a user id of some sort, but it will be consistent throughout all of it's functions.
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