Thanks Mahmud :) Efficient sequences are what I'm working on right now, particularly trying to make persistent versions of the major data structures in PHP. T

Thanks Mahmud :) Efficient sequences are what I'm working on right now, particularly trying to make persistent versions of the major data structures in PHP. Tail calls are another thing, though with PHP 5.3's gotos they could be done (who'd have thought that feature would ever be useful?) Could you elaborate on how I could improve efficiency for macros?