add test for shallow seq copy
add test for shallow seq copy

currently looks like it's not covered

singularperturbation/Nim,endragor/Nim,jsanjuas/Nim,mbaulch/Nim,russpowers/Nim,russpowers/Nim,haiodo/Nim,haiodo/Nim,jfhg/Nim,jfhg/Nim,jsanjuas/Nim,tulayang/Nim,dom96/Nim,endragor/Nim,russpowers/Nim,russpowers/Nim,jfhg/Nim,haiodo/Nim,jfhg/Nim,zachaysan/Nim,zachaysan/Nim,zachaysan/Nim,russpowers/Nim,singularperturbation/Nim,haiodo/Nim,singularperturbation/Nim,endragor/Nim,haiodo/Nim,tulayang/Nim,endragor/Nim,endragor/Nim,singularperturbation/Nim,jfhg/Nim,haiodo/Nim,haiodo/Nim,tulayang/Nim,dom96/Nim,tulayang/Nim,dom96/Nim,mbaulch/Nim,dom96/Nim,dom96/Nim,jsanjuas/Nim,dom96/Nim,mbaulch/Nim,jfhg/Nim,dom96/Nim,jsanjuas/Nim,russpowers/Nim,jfhg/Nim,singularperturbation/Nim,endragor/Nim,singularperturbation/Nim,mbaulch/Nim,endragor/Nim,zachaysan/Nim,zachaysan/Nim,jsanjuas/Nim,russpowers/Nim,zachaysan/Nim,mbaulch/Nim,mbaulch/Nim,tulayang/Nim,jsanjuas/Nim,jsanjuas/Nim,mbaulch/Nim,zachaysan/Nim,singularperturbation/Nim,tulayang/Nim