Hi, Val,

I just fixed expand,VCF to support multiple 'A' columns in info. Looks like
expand,DataFrame does a cartesian product of list columns, which is not
what we want in that case.

Ran up against another hurdle though: the conventional AD genotype field
has a (virtual) Number of 'A+1', but since VCF does not have such a thing,
it's Number is typically missing. Should we special case this one and have
it keep yield a ref,alt pair for each alt? Opinions?

Michael

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