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{ ... }:
# convert any nix string into a netstring
# (prefixed by its length) according to https://en.wikipedia.org/wiki/Netstring
#
# Examples:
# netstring.fromString "foo"
# => "3:foo,"
# netstring.fromString ""
# => "0:,"
s: "${toString (builtins.stringLength s)}:${s},"
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