Type of Params is incorrect

[steinybot]

Params is:

export type Params = Record<string, string>;

But if you get an optional param that is missing you get undefined.

Either the type of Params should be:

export type Params = Record<string, string>;

Or the key for optional parameters should not be present.

[eMerzh]

I have a similar issue with undefined param values,
but if i'm correct we also have the ability to pass array values which isn't represented here either