Cancel sequence hotkey when interrupted by other characters?

[sa-0001]

The following sequence works as expected:

combokeys.bind('q n', function(){ ... })'

However if I bind a combination as well as the sequence:

combokeys.bind(['q+n', 'q n'], function(){ ... })'

or bind the sequence first and then the combination:

combokeys.bind('q+n', function(){ ... })'
combokeys.bind('q n', function(){ ... })'

then both the combination and sequence correctly call the handler, but pressing a key inbetween the q and n, also causes the handler to be called.

q+n -> handler called
q n -> handler called
q f n -> handler also called

Is this a limitation of the library, or is there a way to disallow extraneous keys inbetween sequence keys?