optimize copying slice when toValue and fromValue are different types #238
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Hi !
when using copier, I found a problem that when dst and src are different type slice, existing code will perform two deep-copy for one element in a slice (from -> dest and dest -> to).
when I perform a deepcopy from []*model.XXX to []*business.XXX, the second picture shows that the fromValue of next stack becomes a business.XXX. It will affect the speed of copying. dest is already deepcopy of from, so I think directly using .set is ok.