ei_x_format doesn't support map term

Hi all
I’ve already mentioned it here

There is no support in ei_x_format(*) to work with map term. Map was introduced in erlang decade ago and there is still no support.
ei_x_format(&buf, "#{a=>1}") returns -1

Is it some decision about this or just no one use it at all?

I have my own implementation, but I don’t understand, how to run test suite for erl_interface_test to create good PR in github.