delete(m, k)
		delete(m, strings.ToLower(k))
	}

	return m
}

// generates an ListBucketVersions response for the said bucket with other enumerated options.
func generateListVersionsResponse(ctx context.Context, bucket, prefix, marker, versionIDMarker, delimiter, encodingType string, maxKeys int, resp ListObjectVersionsInfo, metadata metaCheckFn) ListVersionsResponse {