feat(library/data/prod): define swap
feat(library/data/prod): define swap

leanprover-community/lean,javra/lean,fgdorais/lean,leanprover/lean,fgdorais/lean,soonhokong/lean-osx,leanprover-community/lean,leodemoura/lean,fpvandoorn/lean,fpvandoorn/lean,levnach/lean,soonhokong/lean,johoelzl/lean,soonhokong/lean-osx,eigengrau/lean,levnach/lean,dselsam/lean,rlewis1988/lean,UlrikBuchholtz/lean,UlrikBuchholtz/lean,rlewis1988/lean,fpvandoorn/lean2,digama0/lean,johoelzl/lean,javra/lean,fpvandoorn/lean,UlrikBuchholtz/lean,avigad/lean,soonhokong/lean-osx,leodemoura/lean,leanprover-community/lean,soonhokong/lean-windows,Kha/lean,leanprover/lean,rlewis1988/lean,leanprover-community/lean,htzh/lean,c-cube/lean,johoelzl/lean,levnach/lean,digama0/lean,fpvandoorn/lean2,leodemoura/lean,fgdorais/lean,htzh/lean,javra/lean,sp3ctum/lean,soonhokong/lean,leanprover/lean,rlewis1988/lean,sp3ctum/lean,dselsam/lean,fpvandoorn/lean2,leodemoura/lean,leodemoura/lean,htzh/lean,leanprover/lean,soonhokong/lean-windows,soonhokong/lean-windows,htzh/lean,leanprover-community/lean,UlrikBuchholtz/lean,dselsam/lean,digama0/lean,dselsam/lean,dselsam/lean,leanprover/lean,avigad/lean,fpvandoorn/lean,eigengrau/lean,johoelzl/lean,avigad/lean,fpvandoorn/lean,soonhokong/lean-osx,levnach/lean,c-cube/lean,c-cube/lean,sp3ctum/lean,Kha/lean,c-cube/lean,fgdorais/lean,leanprover-community/lean,johoelzl/lean,leodemoura/lean,soonhokong/lean,avigad/lean,johoelzl/lean,soonhokong/lean,sp3ctum/lean,fgdorais/lean,soonhokong/lean-windows,Kha/lean,avigad/lean,fpvandoorn/lean,javra/lean,fpvandoorn/lean2,dselsam/lean,UlrikBuchholtz/lean,digama0/lean,c-cube/lean,leanprover/lean,soonhokong/lean,eigengrau/lean,htzh/lean,eigengrau/lean,fgdorais/lean,avigad/lean,Kha/lean,sp3ctum/lean,rlewis1988/lean,eigengrau/lean,fpvandoorn/lean2,javra/lean,soonhokong/lean-windows,digama0/lean,Kha/lean,levnach/lean,Kha/lean,rlewis1988/lean,soonhokong/lean-osx,digama0/lean