AWS DynamoDB: Why am I missing items?!! Pagination!

Hopefully useful code snippets since the AWS JS SDK http://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/DynamoDB/DocumentClient.html docs don't have great examples:

https://s.natalian.org/2017-05-10/queryvscan.js

Kudos to #node.js for helping me out with the gnarly synchronous code: https://s.natalian.org/2017-05-10/recurse.js ... https://www.youtube.com/watch?v=gQL-cchjX1E