Lambda function for KinesesFirehose transformation broken after latest release

[omartinezpou]

All my Lambda functions for KinesisFirehose data transformation are broken after upgrading to the latest release https://github.com/aws/aws-lambda-go/releases/tag/v1.14.0.

The field SubsequenceNumber has been added to the type struct KinesisFirehoseRecordMetadata
v1.13.3...v1.14.0#diff-a663693284222a7feac21348b40b8c2aR42

It looks like this is causing a type error since KinesisFirehoseEvent events' subsequenceNumber is a number (int,float) and the expected type is string. Error message:
json: cannot unmarshal number into Go struct field KinesisFirehoseRecordMetadata.records.kinesisRecordMetadata.subsequenceNumber of type string: UnmarshalTypeError
Hence, this can be fixed by changing subsequenceNumber field type to int

This issue can be easily reproduced using the sample code from: https://github.com/aws/aws-lambda-go/blob/master/events/README_KinesisFirehose.md

As a workaround, I am able to avoid this error by using the previous version which works just fine.

$ cat go.mod
...
require github.com/aws/aws-lambda-go v1.13.3

[bmoffatt]

Thanks for the report! It made me notice that 1.14.0 release notes didn't clearly show that this change occurred.