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type t = string
let empty = Digest.string ""
let make s = if s = empty then empty else s
let compare = compare
let length = 16
let to_binary s = s
let to_binary_local s = s
let of_binary_exn s =
assert (String.length s = length);
make s
;;
let unsafe_of_binary = make
let to_hex = Digest.to_hex
let of_hex_exn s = make (Digest.from_hex s)
let string s = make (Digest.string s)
let bytes s = make (Digest.bytes s)
let subbytes bytes ~pos ~len = make (Digest.subbytes bytes pos len)