Type issues in Amazon.DynamoDBv2.Model.AttributeValue

[amattie]

AttributeValue's N type is string, but according to the (dynamodb-2012-08-10.normal.json)[https://github.com/aws/aws-sdk-net/blob/master/ServiceModels/dynamodb-2012-08-10.normal.json] service model, it's a "NumberAttributeValue" and thus I think should be a double? or something in AttributeValue.

Also, AttributeValue's constructor only takes a string or List. It'd be easier to use in practice if it accepted the other acceptable attribute types.

[PavelSafronov]

NumberAttributeValue is actually configured as a string.

Thanks for the constructor suggestion, that sounds like a good idea. I'll see if it's possible to add.

[jimfl]

Added to https://github.com/aws/aws-sdk-net/blob/master/FEATURE_REQUESTS.md