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Technically, a CRDT can be anything that follows the merging rules described below. This is a working definition; in practice, implementations in object-oriented languages will end up looking something like this. ↩
IFD is particularly unsuited when you want to do a traversal over a large source tree (for example to discover dependencies of source files), since it requires the entire source tree to be copied to the Nix store—even with lazy trees.