From: Sascha Silbe <sascha@silbe.org>
Subject: [PATCH] add and use type information for "known" properties (#1437)

Bug #1342 has shown that it's necessary to know (and convert/check) the type
of known properties (as we need to use xapian.sortable_serialise() on numeric
types). This patch does that (but doesn't fix #1342 yet, that will be done on
top of it).


Signed-off-by: Sascha Silbe <sascha@silbe.org>