Fluent Assertions: applying equivalency options to collection members

So I want to use custom equivalency criterion in Fluid Assertions (.NET) for collection elements. When applied to class property this works perfectly:

var actual = new Dto() {Value = 1.11};
var expected = new Dto() {Value = 1.1};
actual.ShouldBeEquivalentTo(expected, options =>
            options.Using<double>(x =>
                x.Subject.Should().BeApproximately(
                    x.Expectation, 0.2))
                .WhenTypeIs<double>());

However, when I try to apply the same assertion to colleciton members, I get a failure:

var actual = new [] {1.11};
var expected = new[] {1.1};
...

I get this error:

Expected item[0] to be 1.1, but found 1.11.

With configuration:

• Use declared types and members
• Compare enums by value
• Match member by name (or throw)
• Invoke Action when info.RuntimeType.IsSameOrInherits(System.Double)
• Be strict about the order of items in byte arrays`

Same thing happens when using ShouldAllBeEquivalentTo. Is this by design? Is this a bug? Am I missing a trick here?