I am not very fond of the M_util name. What about keeping the same conventions as Functiora and:

• rename V1 into Mirage
• rename M_util into Mirage_runtime

hmm, this might require some more thinking

• the mirage package provides a mirage-runtime module (located in lib_runtime)
• mirage and mirage-types are independent atm (on the opam level, there's no dependency between them)

--> does it sound better to leave mirage-types as the two interface files as before, and have runtime code in mirage.runtime (then mirage will depend on mirage-types, but that is fine I guess)?

turns out I do not understand the difference between lib_runtime/mirage_runtime.ml{i} and lib/mirage_key.ml{i} - the former contains the log_threshold (included in the latter), and both contain converters for ipv4/ipv6 addresses and prefixes... any insight (likely @Drup knows)?