Commented Unassigned: Collection should contain other collection behaving unexpectedly [12495]

I want to assert that a collection of simple objects includes a smaller collection of the same object type. For some reason actualCollection.Should().Contain(expectedCollection) is failing with a message that shows all of the expected objects are in the actual collection but it's claiming that they aren't.

Here's the assertion failure output I'm getting:
```
Expected collection {
ActivityServiceTest.DataTypes.SocialItemSummary
{
category = "custom"
percentage = 0.333333333333333
},

ActivityServiceTest.DataTypes.SocialItemSummary
{
category = "friends"
percentage = 0
},

ActivityServiceTest.DataTypes.SocialItemSummary
{
category = "friends of friends"
percentage = 0.333333333333333
},

ActivityServiceTest.DataTypes.SocialItemSummary
{
category = "only me"
percentage = 0
},

ActivityServiceTest.DataTypes.SocialItemSummary
{
category = "public"
percentage = 0.333333333333333
}} to contain {

ActivityServiceTest.DataTypes.SocialItemSummary
{
category = "custom"
percentage = 0.333333333333333
},

ActivityServiceTest.DataTypes.SocialItemSummary
{
category = "friends of friends"
percentage = 0.333333333333333
},

ActivityServiceTest.DataTypes.SocialItemSummary
{
category = "public"
percentage = 0.333333333333333
}}, but could not find {

ActivityServiceTest.DataTypes.SocialItemSummary
{
category = "custom"
percentage = 0.333333333333333
},

ActivityServiceTest.DataTypes.SocialItemSummary
{
category = "friends of friends"
percentage = 0.333333333333333
},

ActivityServiceTest.DataTypes.SocialItemSummary
{
category = "public"
percentage = 0.333333333333333
}}
```
Comments: I only do component and integration level testing so I have literally no use for reference equality but I guess there might be reason to use it for unit tests. Can we do a poll on CodePlex regarding this? I have used the method described in your blog post before but it doesn't replace IEnumberable.Contains(), only IEnumberable.Equals(). I'm stuck with implementing Equals() for all of my objects using the current release.