It isn't something either of my kids did, but it does sound like an AS related talent.
Some AS are hyper fast workers when focused. Others, like my son, are and always will be slow (in physical speed) at, well, everything. The former is a great gift to have, so hopefully his talent will spill over into other areas, as well.
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Mom to an amazing young adult AS son, plus an also amazing non-AS daughter. Most likely part of the "Broader Autism Phenotype" (some traits).