[Bugs] #1826 UNSP: Do not fail on type casting for known value types

[Sugar Labs Bugs]

#1826: Do not fail on type casting for known value types
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    Reporter:  alsroot                    |          Owner:  tomeu            
        Type:  defect                     |         Status:  new              
    Priority:  Unspecified by Maintainer  |      Milestone:  0.88             
   Component:  sugar-datastore            |        Version:  Git as of bugdate
    Severity:  Unspecified                |       Keywords:                   
Distribution:  Unspecified                |   Status_field:  Unconfirmed      
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 afaik, we have only particular value types only in core that relates to
 indexstore.py:_QUERY_VALUE_MAP.

 |TestCase|
 * type non numeric symbols to timestamp property file for any ds object
 * remove ~/.sugar/default/datastore/index_updated and
 ~/.sugar/default/datastore/version to force index regeneration
 * trace back in datastore.log and changed ds object can't be seen in
 Journal

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Ticket URL: <https://bugs.sugarlabs.org/ticket/1826>
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