I have a Discord.js Message instance, which, as defined in the documentation, should have a .cleanContent property, and it should be a string.

• console.log(message.cleanContent) works as intended, but
  console.log(message) does not log the cleanContent property.
• More so, Object.keys(message) does not discover the cleanContent property.
• However, JSON.parse(JSON.stringify(message)) has a loggable, visible cleanContent in turn.
• A for(key in message) loop also does not list the .cleanContent.

So, uh.. what is going on here?

The bug is reproducable with this much code:

client.on("messageCreate", (message) => {
  console.log(Object.keys(message))
})