doc(tmp/lean4): explicit reference counting
doc(tmp/lean4): explicit reference counting

dselsam/lean,digama0/lean,dselsam/lean,digama0/lean,leodemoura/lean,leanprover/lean,Kha/lean,leanprover/lean,dselsam/lean,fpvandoorn/lean,digama0/lean,digama0/lean,dselsam/lean,leodemoura/lean,leanprover-community/lean,leanprover-community/lean,leodemoura/lean,fpvandoorn/lean,fpvandoorn/lean,Kha/lean,fpvandoorn/lean,leodemoura/lean,fpvandoorn/lean,leodemoura/lean,Kha/lean,leanprover-community/lean,leanprover/lean,leanprover-community/lean,digama0/lean,fpvandoorn/lean,leanprover/lean,leanprover-community/lean,dselsam/lean,Kha/lean,Kha/lean,leodemoura/lean,leanprover-community/lean,digama0/lean,Kha/lean,leanprover/lean,leanprover/lean,dselsam/lean