[deepkit/bson] Improve error message

[marcj]

When binary data is given that is invalid, like with a missing field, we get cryptic error messages:

type:

type MessageUpdateEvent = { channel: MongoId, type: 'message', message: ChatMessageEntity };
type MessageEvent = { channel: MongoId, type: 'message-update', message: ChatMessageEntity };

type BusMessage<T> = { v: T };
type BusMessageEvent = BusMessage<MessageUpdateEvent  | MessageEvent>;

data:

{
  v: {
    channel: '68ff8ab44ba72208b7652931',
    type: 'message',
    message: undefined
  }
}

error:

v(type): Cannot convert bson type OBJECT to BusMessageEvent. invalid BSON type

[ElshadHu]

Hi, is issue still active? I would like to give it a try .