Type union of paths to leaves of FieldValues object

[slbls]

In the below example, FieldPath<CustomFieldValues> returns both paths to leaves, e.g. name.first and friends.${number}, and partial paths, e.g. name and name.aliases. How would one obtain a type union of only paths leading to leaves (in other words, paths directly to primitive values)?

type CustomFieldValues = {
	name: {
		first: string;
		last: string;
		aliases: NestedValue<string[]>;
	};
	age: number;
	friends: NestedValue<string[]>;
}

// Normal `FieldPath`
// Result: "name" | "age" | "friends" | "name.first" | "name.last" | "name.aliases" | `name.aliases.${number}` | `friends.${number}`
type CustomFieldPath = FieldPath<CustomFieldValues>;

// Desired `AbsoluteFieldPath`
// Result: "name.first" | "name.last" | `name.aliases.${number}` | "age" | `friends.${number}`
type CustomAbsoluteFieldPath = AbsoluteFieldPath<CustomFieldValues>;

[slbls]

After looking further into this, #6466 actually better fulfills the broader intended use case behind this request, where a generic component can be restricted to specific actionable paths.