Don’t reorder “basic” artifacts.

Library/Homebrew/cask/lib/hbc/artifact.rb

@@ -25,39 +25,5 @@ require "hbc/artifact/zap"
 
 module Hbc
   module Artifact
-    # NOTE: Order is important here!
-    #
-    # The `uninstall` stanza should be run first, as it may
-    # depend on other artifacts still being installed.
-    #
-    # We want to extract nested containers before we
-    # handle any other artifacts.
-    #
-    CLASSES = [
-      PreflightBlock,
-      Uninstall,
-      NestedContainer,
-      Installer,
-      App,
-      Suite,
-      Artifact, # generic 'artifact' stanza
-      Colorpicker,
-      Pkg,
-      Prefpane,
-      Qlplugin,
-      Dictionary,
-      Font,
-      Service,
-      StageOnly,
-      Binary,
-      InputMethod,
-      InternetPlugin,
-      AudioUnitPlugin,
-      VstPlugin,
-      Vst3Plugin,
-      ScreenSaver,
-      PostflightBlock,
-      Zap,
-    ].freeze
   end
 end

Library/Homebrew/cask/lib/hbc/artifact/abstract_artifact.rb

@@ -21,34 +21,42 @@ module Hbc
       end
 
       def <=>(other)
+        return unless other.class < AbstractArtifact
+        return 0 if self.class == other.class
+
         @@sort_order ||= [ # rubocop:disable Style/ClassVars
           PreflightBlock,
+          # The `uninstall` stanza should be run first, as it may
+          # depend on other artifacts still being installed.
           Uninstall,
+          # We want to extract nested containers before we
+          # handle any other artifacts.
           NestedContainer,
           Installer,
-          App,
-          Suite,
-          Artifact,        # generic 'artifact' stanza
-          Colorpicker,
-          Pkg,
-          Prefpane,
-          Qlplugin,
-          Dictionary,
-          Font,
-          Service,
-          StageOnly,
+          [
+            App,
+            Suite,
+            Artifact,
+            Colorpicker,
+            Prefpane,
+            Qlplugin,
+            Dictionary,
+            Font,
+            Service,
+            InputMethod,
+            InternetPlugin,
+            AudioUnitPlugin,
+            VstPlugin,
+            Vst3Plugin,
+            ScreenSaver,
+          ],
           Binary,
-          InputMethod,
-          InternetPlugin,
-          AudioUnitPlugin,
-          VstPlugin,
-          Vst3Plugin,
-          ScreenSaver,
+          Pkg,
           PostflightBlock,
           Zap,
-        ]
+        ].each_with_index.flat_map { |classes, i| [*classes].map { |c| [c, i] } }.to_h
 
-        (@@sort_order.index(self.class) <=> @@sort_order.index(other.class)).to_i
+        (@@sort_order[self.class] <=> @@sort_order[other.class]).to_i
       end
 
       # TODO: this sort of logic would make more sense in dsl.rb, or a