It seems that the coverage method for BamFile() reads the entire BAM file
into memory and then calls coverage.  Is there a coverage method for
BamFiles that does not read the entire BAM file into memory first?  If not,
does it make sense to augment the BamFile coverage method to do so in
chunks?  It is easy enough to write code to do so and there is even an
example in the GenomicRanges HowTos, but having the method handle the use
case would simplify matters just a bit.

Thanks,
Sean

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