[fsa] concat order

I noticed yesterday that the Fsa command-line tool's concat operator works backward from what I expected. It puts the transducer at the top of the stack (what I think of as right-most) at the front of the concatenated transducer. Is this the intended behavior? It seems especially strange since for the operations that take two transducers as arguments, second_ is defined as the top of the stack, and first_ as the position below it. Thanks, Roy