This is a question on the Cloud Storage APIs.
While trying to fix #200 I did a POST request to get a resumable upload URI:

https://www.googleapis.com/upload/storage/v1/b/bucket/o?uploadType=resumable&name=file&ifGenerationMatch=42

The request returned status 200 even though the object I was requesting the upload URI for had different generation. So, does this API actually check for (meta)generation matches? Is this behavior intended?
If so we can avoid passing options to the StorageRpc.open method.