channelUpdate Permissions

Hey there, how can I retreive the permission changes on the event? Upon fetching the audit logs and looking for the channelUpdate AuditLogEvent,

logs.entries.first().changes

logs.entries.first().changes

logs.entries.first().changes

logs.entries.first().changes logs this

[ { key: 'allow', old: '1040', new: '268436496' } ]

[ { key: 'allow', old: '1040', new: '268436496' } ]

[ { key: 'allow', old: '1040', new: '268436496' } ]

[ { key: 'allow', old: '1040', new: '268436496' } ]

How can I use the bitfields to actual permissions?