fn test_fixed_array_string_keys() {
    mut m := map[[2]string]int{}
    key := ['foo', 'bar']!
    lookup := ['foo', 'bar']!
    m[key] = 5
    assert m[key] == 5
    assert m[lookup] == 5
    assert lookup in m
    assert m.len == 1
}

fn test_nested_fixed_array_string_keys() {
    mut m := map[[2][2]string]int{}
    key := [
        ['alpha', 'beta']!,
        ['gamma', 'delta']!,
    ]!
    lookup := [
        ['alpha', 'beta']!,
        ['gamma', 'delta']!,
    ]!
    m[key] = 9
    assert m[lookup] == 9
    assert key in m
}