Fix ext type type error related issues

msgpack / msgpack-cli

MessagePack implementation for Common Language Infrastructure / msgpack.org[C#]

http://msgpack.org

Apache License 2.0

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Closed yfakariya closed 7 years ago

yfakariya commented 7 years ago

This PR fixes minor issues reported in a part of #269.

Fix MessagePackObject.UnderlyingType reports wrong type for ext types. This bug also caused misleading error message for incompatible type conversion.
Fix exceptions thrown by MessagePackObject.AsBinary()/AsString() reports internal type name.