[Bugs] #1437 UNSP: add and use type information for Xapian value-stored properties

[Sugar Labs Bugs]

#1437: add and use type information for Xapian value-stored properties
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    Reporter:  sascha_silbe               |          Owner:  sascha_silbe     
        Type:  task                       |         Status:  new              
    Priority:  Unspecified by Maintainer  |      Milestone:  0.88             
   Component:  sugar-datastore            |        Version:  Git as of bugdate
    Severity:  Unspecified                |       Keywords:  r?               
Distribution:  Unspecified                |   Status_field:  Assigned         
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 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).

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Ticket URL: <http://bugs.sugarlabs.org/ticket/1437>
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