Ensure priority sort over alpha sort

- Added extension priority map. This is an imperfect solution, and is
  not used by default with default configuration (column-based data).

  - We may want to consider a revised columnar format for a future
    version that has a bit more information than is present in the base
    file.

- Adding the sort priority and extension priority helped, but because
  the alphanumeric sort was first in `MIME::Type#priority_compare`, the
  results weren't as good as they should have been. We now sort by the
  sort priority values _first_ and the alphanumeric values _second_.

  - Stored sort priority was not respected because it depends on flags
    not kept in the base file. Added support for a binary file with this
    to ensure it is loaded.

1 files changed, 11 insertions, 0 deletions

diff --git a/lib/mime/type/columnar.rb b/lib/mime/type/columnar.rb
index ec4dec2..a51f9d9 100644
--- a/lib/mime/type/columnar.rb
+++ b/lib/mime/type/columnar.rb
@@ -53,6 +53,17 @@ class MIME::Type::Columnar < MIME::Type
     super
   end
 
+  def update_sort_priority
+    if @container.__fully_loaded?
+      super
+    else
+      obsolete = (@__sort_priority & (1 << 7)) != 0
+      registered = (@__sort_priority & (1 << 5)) == 0
+
+      @__priority_penalty = (@obsolete ? 3 : 0) + (@registered ? 0 : 2)
+    end
+  end
+
   class << self
     undef column
   end