Replace_deprecated_csv is a drop-in replacement for existing users of
Async_extended.Delimited. It is faster, tested, and supported.
Whereas Async_extended.Delimited used Deprecated_csv, Replace_deprecated_csv
implements the same interface using Csv. Thus, code written against
Async_extended.Delimited can upgrade to the new parser with one line:
open Delimited_parsing.Replace_deprecated_csv
module Delimited : sig ... end