ACL summary from GetObjectAcl.
CRC-32 checksum if returned by S3.
MD5 / ETag (from non-multipart uploads).
SHA-256 checksum if returned by S3.
Properties from HeadObject.
Glacier/Deep Archive restore status.
Value(null) means the object is in a non-Glacier class.
Value(RestoreStatus) carries the parsed status.
Object tags from GetObjectTagging.
Version ID (also on head.versionId).
Aggregated read-only properties for a single S3 object.
restoreStatusis{ kind: "value", value: null }for non-Glacier objects.