Discuss how TypeSpec unknown is generated in DPG

[joheredi]

Here are the options:

• Literal translation - Gets generated as unknown
• Follow the openapi emitter - Generate a any object Record<string, unknown> or Record<string, any> (link)
• Generate as any

[qiaozha]

In the context that we don't split input model and output model, I prefer to generate as any. Because unknown will require customer to guard each access check and any doesn't need this.
Just one point to note here, any -> unknown is a breaking while unknown -> any is not.

[MaryGao]

Follow the openapi emitter - Generate a any object Record<string, unknown> or Record<string, any>

Not sure I got the point here but I think for openapi the unknown is not a any object but any type see Tim's comment here.

[qiaozha]

I think we have decided to treat unknown as any? #2469 (comment)