For a constructor argument it is a constructed value of size 2 and tag
[Obj.object_tag]:
- the first field of this value is a string, it is the name of the
constructor
- the second field is a unique integer identifier

For a constructor with [n] arguments, it is of value of size [n+1]. The
first field points to the same 2-fields constructed value described above
and the other fields are the arguments.

The reason the tag of the constructor "bucket" is [Obj.object_tag] is so
that the generic [Pervasives.compare] compares only the integer identifiers
in the second fields.


On Tue, May 13, 2014 at 4:53 PM, Milan Stanojević <milanst@gmail.com> wrote:

> 4.02 will have extensible data types.
>
> What is the runtime representation of an extensible data type?
>
> Thanks!
>
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-- 
Jeremie