pgocaml
                                
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                        Enum support
Based on this patch
https://lists.ocamlcore.org/pipermail/pgocaml-general/2013-June/000044.html
For ease of reviewing, the original diff is split into patches grouped by functionality.
For anyone reaching this PR like I did and wondering why it hasn't been merged:
https://lists.ocamlcore.org/pipermail/pgocaml-general/2016-August/000088.html
Further explanation here for whoever wants to clean up this patch set:
https://lists.ocamlcore.org/pipermail/pgocaml-general/2013-August/000045.html
I proposed a much simpler patch which unravel enums to just strings. See #33.