Added method `#eql?` to `ActiveSupport::Duration`, in addition to `#==`.

Currently, the following returns `false`, contrary to expectation:

    1.minute.eql?(1.minute)

Adding method `#eql?` will make this behave like expected. Method `#eql?` is
just a bit stricter than `#==`, as it checks whether the argument is also a
uration. Their parts may be different though.

    1.minute.eql?(60.seconds)  # => true
    1.minute.eql?(60)          # => false

1 files changed, 8 insertions, 0 deletions

diff --git a/activesupport/test/core_ext/duration_test.rb b/activesupport/test/core_ext/duration_test.rb
index 5e3987265b..53fce5d8f0 100644
--- a/activesupport/test/core_ext/duration_test.rb
+++ b/activesupport/test/core_ext/duration_test.rb
@@ -30,6 +30,14 @@ class DurationTest < ActiveSupport::TestCase
     assert !(1.day == 'foo')
   end
 
+  def test_eql
+    assert 1.minute.eql?(1.minute)
+    assert 1.minute.eql?(60.seconds)
+    assert 1.minute.eql?(180.seconds - 2.minutes)
+    assert !1.minute.eql?(60)
+    assert !1.minute.eql?('foo')
+  end
+
   def test_inspect
     assert_equal '0 seconds',                       0.seconds.inspect
     assert_equal '1 month',                         1.month.inspect