Introducing the Application role, as per 28:137

src/core/Application.pm

@@ -0,0 +1,13 @@
+role Application {
+    has Str $.name;
+    has Str $.auth;
+    has Version $.version;
+
+    submethod BUILD (
+      :$!name    = "unknown",
+      :$!auth    = "unknown",
+      :$!version = Version.new("unknown"),
+    ) {}
+    method gist { $!name ~ (" ($!version)" if $!version ne "vunknown") }
+    method Str  { $!name }
+}