This change allows changing the username on credentials
Created attachment 439609 [details] Patch
Created attachment 439697 [details] Patch
Comment on attachment 439697 [details] Patch r=me
Created attachment 440097 [details] Patch for landing
Committed r283514 (242482@main): <https://commits.webkit.org/242482@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 440097 [details].
<rdar://problem/83855749>
This is actually: <rdar://problem/83471755>