Usrs sometimes have multiple leading identifiers, in this case e: for
extension. Previously we supported stripping a single s:, now we
support stripping all the leading identifiers as long as they still
start with s: (and not c: like some Objective-C USRs).
Usrs sometimes have multiple leading identifiers, in this case
e:for extension. Previously we supported stripping a singles:, now we support stripping all the leading identifiers as long as they still start withs:(and notc:like some Objective-C USRs).