There is support for supporting an abbreviated identifier on the default branch.
<rdar://problem/70299119>
Created attachment 411350 [details] Patch
Comment on attachment 411350 [details] Patch rs=me
Created attachment 411452 [details] Patch for landing
Committed r268531: <https://trac.webkit.org/changeset/268531> All reviewed patches have been landed. Closing bug and clearing flags on attachment 411452 [details].