Function kind_of_param 

pub fn kind_of_param(system: SystemKind, name: &str) -> ParamKind

The ParamKind name is declared with, searching system’s own roster first and then the global compositing stages — the same rosters in the same order is_known_param tests, so a name that is known there has a kind here.

ParamKind::Modal for a name no roster declares, which is the ADR-0020 warning case: the binding is kept, nothing reads it, and quantizing a value no scene receives would be a decision about nothing.