Contact model id is sometimes serialized, sometimes a Wid object

[gekkedev]

Description

As stated in the tile, the Contact model's id attribute is sometimes a Wid and sometimes a string. I thought I had corrected this in #2285 but changed it from one possible type to another.

Example`s

  client.onMessage(async (message: Message) => {
    //.sender.id is a serialized string
  }

  await client.getMessageById("user@server")
  //.sender.id is an object

To cover up the symptoms I can offer to create a PR that changes the type definition to allow both. Still unclear to me: when exactly to expect which type.
As a result, everyone using WPPConnect has to address this in their code if they want type safety. However, why does this happen in the first place? Is it possible that WA-JS sometimes serializes/deserializes when it shouldn't?