CollectionAssert.AreEqual fails for list of strings using IEqualityComparer following #3275

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Describe the bug

Following #3275, comparing two lists of strings (List<string>) fails when an IEqualityComparer is passed, with the intention of ignoring case for example.

Steps To Reproduce

Setup: create a MSTest project. Put following code in a sample test:

List<string> expected = ["one", "two"];
List<string> actual   = ["ONE", "tWo"];

CollectionAssert.AreEqual(expected, actual, StringComparer.OrdinalIgnoreCase);

Expected behavior

Test passes.

Actual behavior

Test fails.

Additional context

From looking at the code, I expect it's because strings are IEnumerable.