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Allow ARNs to retrieve region and account from Boto3 session

2

A boto3 Session object has the `Session.region_name` field, and can call `Session.client('sts').get_caller_identity()` to discover the account in which it is operating (this call has no authorization check, so it is...

benkehoe

ARN classes should understand whether they have region or account values

1

Some ARNs, like for S3 buckets, have neither region nor account in them. Others, like IAM resources, don't have region but do have account. The ARN subclasses should be aware...

benkehoe