bottle_resolve_version: return PkgVersion

Library/Homebrew/bottles.rb

@@ -58,7 +58,7 @@ def bottle_resolve_formula_names bottle_file
 end
 
 def bottle_resolve_version bottle_file
-  Version.new bottle_receipt_path(bottle_file).split("/")[1]
+  PkgVersion.parse bottle_receipt_path(bottle_file).split("/")[1]
 end
 
 class Bintray

Library/Homebrew/cmd/cleanup.rb

@@ -83,7 +83,13 @@ module Homebrew
         next
       end
 
-      if f.version > version || ARGV.switch?('s') && !f.installed? || bottle_file_outdated?(f, file)
+      file_is_stale = if PkgVersion === version
+                        f.pkg_version > version
+                      else
+                        f.version > version
+                      end
+
+      if file_is_stale || ARGV.switch?('s') && !f.installed? || bottle_file_outdated?(f, file)
         cleanup_path(file) { file.unlink }
       end
     end