[Bugs] #1342 IMME: range queries use lexical comparison, not numerical

[Sugar Labs Bugs]

#1342: range queries use lexical comparison, not numerical
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    Reporter:  sascha_silbe     |          Owner:  sascha_silbe     
        Type:  defect           |         Status:  new              
    Priority:  Immediate        |      Milestone:  0.86             
   Component:  sugar-datastore  |        Version:  Git as of bugdate
    Severity:  Minor            |       Keywords:  r?               
Distribution:  Unspecified      |   Status_field:  Assigned         
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Comment(by tomeu):

 {{{
 >>> xapian.sortable_serialise('2.0')
 Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
 TypeError: in method 'sortable_serialise', argument 1 of type 'double'
 }}}

 I think we should be able to accept strings in properties['timestamp'].

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Ticket URL: <http://bugs.sugarlabs.org/ticket/1342#comment:2>
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