[BioC] IRanges: find containment and not just overlap

[Elizabeth Purdom]

Hi,
I'm very happy with the efficiency of the overlap function and I was 
wondering if there is a fast way in IRanges to find which of the ranges 
in one set are completely contained by one or more ranges in another set 
(i.e. the same idea as overlap, but more restrictive criteria than any 
overlap)? I don't want to assume anything about my two set of ranges 
(e.g. that they are 'normal').
Thanks very much,
Elizabeth Purdom
UC, Berkeley