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I've noticed that the code for the annotations ABHet and ABHom (AlleleBalance) have changed since the 3.7 version (commit 6156b85, "Fixed logic error and tidied AlleleBalance and AlleleBalanceBySample").
Before the 3.7 version, each count was weighted according to its genotype quality while since the 3.7 version, counts are no more weighted so that basically the ABHet ABHom ratios are just count ratios.
I know this annotation is "experimental" but I wonder why these changes have been made for ?