Alternation Syntax
The v3 alternation syntax of %{foo:-bar} is no longer necessary, and has been removed.
The new approach is simpler and clearer, just use short-circuit ||:
in an expression.
Old Style - no longer supported
Reply-Message := "Hello %{%{User-Name}:-none}"New Alternation
Reply-Message := "Hello %{User-Name || 'none'}"This approach also means that nested alternation is no longer necessary:
Old Style - no longer supported
Reply-Message := "Hello %{%{NAS-Identifer}:-%{%{User-Name}:-none}}"New Alternation
Reply-Message := "Hello %{NAS-Identifier || User-Name || 'none'}"|
Unlike version 3, any strings used in |