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    Type:
Bug
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    Resolution: Done
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    Priority:
Major - P3
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    Affects Version/s: 1.7.0
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    Component/s: BSON, C Extensions
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    Environment:Rails 3.2.7
Rubygems 1.4.2 
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I found out BSON::BSON_C.serialize in BSON_EXT doesn't work on hash which used a number as key
eg. 
Error as below.================
#<TypeError: keys must be strings or symbols>