Question related to changes in request parameters

With `apollo-datasource-rest` it was possible to set a third argument and set fields there which were used internally in `willSendRequest` in our codebase. Given that `@apollo/datasource-rest` only supports two arguments, how would you recommend supplying additional data fields that are purely for internal use and that we don’t intend to send to a server but to use at a later point of execution? Would you recommend setting a new field in the second argument?

Example of what we have with `apollo-datasource-rest`:
```
this.patch(path, input, {
someBooleanField: true,
});
```

Thank you.

Review the @apollo/datasource-rest request method signatures and the willSendRequest lifecycle described by the issue. Compare the previous three-argument usage with the current two-argument API and document the supported way to retain internal-only fields; done means the recommendation is explicit and does not send those fields to the server.

Written by the indexing model from the issue text.