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why Hashtbl.t are not covarint?
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Date: 2009-01-14 (08:02)
From: Radzevich Belevich <radzevich.belevich@g...>
Subject: why Hashtbl.t are not covarint? 
hashtbl.mli: type ('a,'b) t
Why not "type ('a,+'b) t"?