New version of aws-sdk has a validation for Number, doesn't accept String anymore

This was an error I was getting:

    Error: Expected params.PartNumber to be a number
    at fail (/Users/marekhrabe/dev/generator/plugins/piffle-exporter/node_modules/aws-sdk/lib/param_validator.js:125:26)
    at validateType (/Users/marekhrabe/dev/generator/plugins/piffle-exporter/node_modules/aws-sdk/lib/param_validator.js:152:10)
    at validateScalar (/Users/marekhrabe/dev/generator/plugins/piffle-exporter/node_modules/aws-sdk/lib/param_validator.js:111:21)
    at validateMember (/Users/marekhrabe/dev/generator/plugins/piffle-exporter/node_modules/aws-sdk/lib/param_validator.js:75:21)
    at validateStructure (/Users/marekhrabe/dev/generator/plugins/piffle-exporter/node_modules/aws-sdk/lib/param_validator.js:55:14)
    at validate (/Users/marekhrabe/dev/generator/plugins/piffle-exporter/node_modules/aws-sdk/lib/param_validator.js:30:17)
    at Request.VALIDATE_PARAMETERS (/Users/marekhrabe/dev/generator/plugins/piffle-exporter/node_modules/aws-sdk/lib/event_listeners.js:111:32)
    at Request.callListeners (/Users/marekhrabe/dev/generator/plugins/piffle-exporter/node_modules/aws-sdk/lib/sequential_executor.js:132:20)
    at Request.<anonymous> (/Users/marekhrabe/dev/generator/plugins/piffle-exporter/node_modules/aws-sdk/lib/sequential_executor.js:123:18)
    at /Users/marekhrabe/dev/generator/plugins/piffle-exporter/node_modules/aws-sdk/lib/event_listeners.js:98:9