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depends on NixOS/nix#9114
if that PR is merged, lookup paths will be a distinct Nix language construct with its own reference documentation.
Context
recent additions to the Nix manual clarify the distinction between
search path and lookup path, and also document the resolution algorithm.
this clarifies a lot about how all that stuff works, and also exposes its hidden complexities, allowing us to tell a consistent story about how to use stable Nix interfaces while staying out of trouble.