Edited Issue: Inconsistent ShouldBeEquivalentTo() behaviour for collections of complex types [12484]

I'm having trouble comparing lists of objects that come back in an indeterminate order. I thought `ShouldBeEquivalentTo()` would take care of this for me, but it doesn't seem to :(
Check out the comments in following sample class for a more thorough description.
```
using System.Collections.Generic;
using FluentAssertions;
using NUnit.Framework;

namespace CrazyMo.Tests
{
[TestFixture]
public class ShouldBeEquivalentToTests
{
public class SomeClass
{
public int SomeInt { get; set; }
}
[Test]
public void DoSomethingAwesome_Scenario_ExpectedResult()
{
SomeClass some1 = new SomeClass { SomeInt = 1 };
SomeClass someOther1 = new SomeClass { SomeInt = 1 };
some1.ShouldBeEquivalentTo(someOther1); // This works

IEnumerable<int> someInts = new List<int> {1, 2};
IEnumerable<int> someOtherInts = new List<int> {2, 1};
someInts.Should().BeEquivalentTo(someOtherInts); // This works
someInts.Should().BeEquivalentTo(2, 1); // This works

IEnumerable<SomeClass> actual = new List<SomeClass>
{
new SomeClass{SomeInt = 1},
new SomeClass{SomeInt = 2}
};

// This does work
actual.ShouldBeEquivalentTo(new List<SomeClass>{
new SomeClass { SomeInt = 1 },
new SomeClass { SomeInt = 2 }
});


// The following is in reverse order, just like someOtherInts above.
// This doesn't work, but should?
actual.ShouldBeEquivalentTo(new List<SomeClass>
{
new SomeClass{SomeInt = 2},
new SomeClass{SomeInt = 1}
});
// This is similar to BeEquivalentTo(2, 1) above, but doesn't work.
// It's even in the correct order.
actual.Should().BeEquivalentTo(
new SomeClass { SomeInt = 1 },
new SomeClass { SomeInt = 2 }
);

}
}
}
```