feat(init/logic): add cast_heq
feat(init/logic): add cast_heq

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