V2 defined the manifest version in a "manifest_version" field. V3 defines the manifest version in a "manifest" field. In order to increase the delineation between V2 & V3 manifests, it would be useful to make it illegal to use a top-level key of "manifest_version" in V3 manifests. While it's unlikely that users would add a user-defined field of "manifest_version" to a V3 manifest, explicitly forbidding this field will make it easier for machines to distinguish b/w V2 & V3 manifests.
V2 defined the manifest version in a
"manifest_version"field. V3 defines the manifest version in a"manifest"field. In order to increase the delineation between V2 & V3 manifests, it would be useful to make it illegal to use a top-level key of"manifest_version"in V3 manifests. While it's unlikely that users would add a user-defined field of"manifest_version"to a V3 manifest, explicitly forbidding this field will make it easier for machines to distinguish b/w V2 & V3 manifests.