StorageRpc.open not setting the correct match parameters

The following code:

storage.writer(BlobInfo.builder("bucket", "name").generation(42L).build(), 
  Storage.BlobTargetOption.generationMatch());

issues a POST request to the URL:

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

where ifGenerationNotMatch instead of ifGenerationMatch is set.

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