intarray bigint support

I got excited about using intarray to replace a couple custom pl/pgsql functions (namely for subtraction and sorting)
thatI'm currently relying on, but then discovered that it doesn't support bigint arrays.  So it won't work for all of
myuse cases, since some IDs that are in the arrays I'm working with are bigint.  Thought I'd ask to see if it might be
asimple enough thing to add bigint support to the extension in a future version? 

Thanks,
--
Casey