Fixed issue where errorHandler in BsonInputFormatter is invoked multitple times #213
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…voked multitple times
pluma9
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CreateJsonSerializer()may return a serializer that was previously returned to the pool. This means this serializer'sErrorevent already have a subscriber. If we try to add more subscribers (jsonSerializer.Error += errorHandler;), theerrorHandlerwill be invoked multiple times when the serializer fail toDeserialize. Therefore, we need to remove the subscriber before returning the serializer to the pool.