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

[Sugar Labs Bugs]

#1826: Do not fail on type cast for known value types
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    Reporter:  alsroot                    |          Owner:  alsroot          
        Type:  defect                     |         Status:  assigned         
    Priority:  Unspecified by Maintainer  |      Milestone:  0.90             
   Component:  sugar-datastore            |        Version:  Git as of bugdate
    Severity:  Major                      |       Keywords:                   
Distribution:                             |   Status_field:  New              
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Changes (by sascha_silbe):

 * cc: silbe (added)
  * distribution:  Unspecified =>
  * status_field:  Unconfirmed => New
  * severity:  Unspecified => Major
  * milestone:  0.88 => 0.90


Comment:

 A missing timestamp property will trigger this bug as well.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/1826#comment:4>
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