Structured keys (Array, Object) not supported

I was doing some test on my projet using your library, and an exception was thrown for a major type 4 not supported on this payload:

Diagnostic payload: {[3,0,0]:"test"}

But the major type 4 is working with this one: [{0: "0"}, {0: "1"}]

I'm using the default CBORMapper, with the method: readValues(buffer, Object.class) for this test.

Is this a problem on the library ? Or it's not supported ? In the second case, do you plan to support it in the future ?