Adding all this support for the native binary result format is pretty hard. The reason is pretty simple: it is not documented. One has to query the conversion methods for each datatype from a running PostgreSQl database, then lookup the method within the PostgreSQL source code and interpet the code.
Therefore the next version will be published, when most of these datatypes have been done. Up to now int2, int4 and int8 has been done, box, boolean, strings. I now working on numerical and decimal, which is reverse engineering. Then date, time and timestamps are coming and then – at last – most of the other “special” datatypes.