Assert.Equals fails for a dictionary containing a null

[igurney-codat]

Fails in version 2.6.2 but works in 2.6.1.

        [Fact]
        public void DictionaryOfNullable_Equals_IdenticalData()
        {
            IDictionary<string, int?> dictionary1 = new Dictionary<string, int?> { { "null", null }, { "a", 1 }, { "b", 2 }, { "c", 3 } };
            IDictionary<string, int?> dictionary2 = new Dictionary<string, int?> { { "null", null }, { "a", 1 }, { "b", 2 }, { "c", 3 } };

            Assert.Equal(dictionary1, dictionary2);
        }

[igurney-codat]

I think this is a duplicate of #2824