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Does GATK honor the SO BAM header tag?

This is not specifically answered in the Collected FAQs about BAM files so need a confirmation.

Do all GATK tools use the SO tag in the header to indicate if the BAM file is sorted? In other words, if the input BAM to a tool is sorted, but the output is not, would GATK alter the SO tag?

As an example, does IndelRealigner produce a sorted BAM?

The SO tag of the ouptput says SO:coordinate, but my input was also sorted. I'd like to assume that all is well, but would like a human confirmation.

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