The docs mention that I can specify a generation property when adding an ACL, but doesn't give much background on how that works.

Could we add a real life example of when generation is used ? And a link to "learn more about object versioning" ?

References:

• https://github.com/GoogleCloudPlatform/gcloud-node/blob/6904e1181c585e3e5042d124df6bc295da3e5c42/lib/storage/acl.js#L94
• https://cloud.google.com/storage/docs/object-versioning