Insisting on a specific implementation, rather than proposing a clear problem, suggesting a possible solution, and “not being married” to your initial preferred solution.

The feature is highly likely to be implemented, the API and implementation are the only real topics of discussion right now.

Please focus on explaining the motivation so that if this RFC is not accepted, the motivation could be used to develop alternative solutions. In other words, enumerate the constraints you are trying to solve without coupling them too closely to the solution you have in mind.