Revert PR#47 "Add #to_ary to Diff::LCS::Change…"

This reverts commits 01e0cae and 3b4d2be because they introduce fatally
breaking changes in the tests that were hidden by broken CI.

* 01e0cae: Add #to_ary to Diff::LCS::Change and Diff::LCS::ContextChange
  [Akinori MUSHA]
* 3b4d2be: Mention in rdoc that Diff::LCS::ContextChange can be converted to an
  array [Akinori MUSHA]

lib/diff/lcs.rb

@@ -181,20 +181,6 @@ def diff(seq1, seq2, callbacks = nil, &block) # :yields diff changes:
   # Class argument is provided for +callbacks+, #diff will attempt to
   # initialise it. If the +callbacks+ object (possibly initialised) responds
   # to #finish, it will be called.
-  #
-  # Each element of a returned array is a Diff::LCS::ContextChange object,
-  # which can be implicitly converted to an array.
-  #
-  #   Diff::LCS.sdiff(a, b).each do |action, (old_pos, old_element), (new_pos, new_element)|
-  #     case action
-  #     when '!'
-  #       # replace
-  #     when '-'
-  #       # delete
-  #     when '+'
-  #       # insert
-  #     end
-  #   end
   def sdiff(seq1, seq2, callbacks = nil, &block) #:yields diff changes:
     diff_traversal(:sdiff, seq1, seq2, callbacks || Diff::LCS::SDiffCallbacks,
                    &block)

lib/diff/lcs/change.rb

@@ -41,8 +41,6 @@ def to_a
     [ @action, @position, @element ]
   end
 
-  alias to_ary to_a
-
   def self.from_a(arr)
     arr = arr.flatten(1)
     case arr.size
@@ -134,8 +132,6 @@ def to_a
     ]
   end
 
-  alias to_ary to_a
-
   def inspect(*args)
     to_a.inspect
   end

spec/change_spec.rb

@@ -62,28 +62,4 @@
     it { should_not be_finished_a }
     it { should     be_finished_b }
   end
-
-  describe "as array" do
-    it "should be converted" do
-      action, position, element = described_class.new('!', 0, 'element')
-      expect(action).to eq '!'
-      expect(position).to eq 0
-      expect(element).to eq 'element'
-    end
-  end
-end
-
-describe Diff::LCS::ContextChange do
-  describe "as array" do
-    it "should be converted" do
-      action, (old_position, old_element), (new_position, new_element) =
-        described_class.new('!', 1, 'old_element', 2, 'new_element')
-
-      expect(action).to eq '!'
-      expect(old_position).to eq 1
-      expect(old_element).to eq 'old_element'
-      expect(new_position).to eq 2
-      expect(new_element).to eq 'new_element'
-    end
-  end
 end