AtNotification "operation" is string "null" instead of type null

[JeremyTubongbanua]

I executed the following:

notify:messageType:text:@22easy:12345

Which produced a notification:

{
    "id":"ce872442-a3e5-4624-b27c-f37a69e6bd3e",
    "from":"@soccer0",
    "to":"@22easy",
    "key":"@22easy:12345",
    "value":null,
    "operation":"null",
    "epochMillis":1671491603639,
    "messageType":"MessageType.text",
    "isEncrypted":false
}

Notice how "value" has a value of null but "operation" has a string value of "null".

Is this on purpose or a mistake?