For now all decoding all those pickles is tested to give the same
object, as in e.g.

	"(I1\nI2\ntp0\n.", // MARK + TUPLE + INT

and

	"I1\nI2\n\x86."),  // TUPLE2 + INT

But having a way to specify several pickles to a test case will become
even more handy when later adding precise tests for Encoder - there we
will need to assert that at such and such protocol encoding gives such
and such pickles. And there are 5 protocol versions to test...