*Warning message:*
*In .Seqinfo.mergexy(x, y) :*
* Each of the 2 combined objects has sequence levels not in the other:*
* - in 'x': chr4, chr16, chr10, chr11, chr18, chr20, chr22*
* - in 'y': chrY*
* Make sure to always combine/compare objects based on the same reference*
* genome (use suppressWarnings() to suppress this warning).*
*It seems to me that if we can check equality of the assigned genomes, we
should*
*not issue this warning.*