restructure Distribution; do work once

src/core/Distribution.pm

@@ -2,33 +2,34 @@ class Distribution {
     has $.id is rw;
     has $.name;
     has $.auth;
-    has $.author;
-    has $.authority;
     has $.ver;
-    has $.version;
     has $.description;
     has @.depends;
     has %.provides;
     has %.files;
     has $.source-url;
-    method auth { $!auth // $!author // $!authority }
-    method ver  { $!ver // $!version }
-    method hash {
-        {
-            :$!id,
-            :$!name,
-            :$.auth,
-            :$.ver,
-            :$!description,
-            :@!depends,
-            :%!provides,
-            :%!files,
-            :$!source-url,
+
+    submethod BUILD(
+        :$!id,
+        :authority(:author(:$!auth)) = '',
+        :$!name                      = '',
+        :version(:$!ver)             = Version.new('0'),
+        :$!description,
+        :@!depends,
+        :%!provides,
+        :%!files,
+        :$!source-url,
+    ) {
+        unless nqp::istype($!ver, Version) {
+            $!ver = !$!ver || $!ver eq '*'
+                  ?? Version.new('0')
+                  !! Version.new(~$!ver)
         }
     }
 }
 
-# during CURLI migration period
-class CompUnitRepo::Distribution is Distribution {
-    method Hash { self.hash }
+# XXX Needed for Inline::Perl5:
+#   https://github.com/niner/Inline-Perl5/blob/master/lib/Inline/Perl5.pm6#L22
+multi sub postcircumfix:<{ }> (Distribution:D \d, "files" ) {
+    d.files
 }