"readonly" not highlighted property when appearing after "private" in constructor()

This code:

export class Searcher {
    private selection: Selection;

    constructor(readonly board: Board, private readonly originalSelection: Selection) {
        this.selection = {
            start: this.originalSelection.start,
            focus: this.originalSelection.focus,
            axis: this.originalSelection.axis,
        };
    }

   ...
}

Appears like this in Sublime Text build 3126, macOS 10.11.5, TypeScript plugin v2.0.1:

I expect the "readonly" and "private" modifiers to have the same highlighting, as red, not orange.

It appears that the syntax highlighter in GitHub also has this problem (as I file this issue):

Should I submit this issue against the TmLanguage definition instead?

Start by tracing how the plugin or the linked TypeScript-TmLanguage definition assigns scopes to constructor parameter modifiers, using the reported private readonly example as the reproduction case. Done means readonly receives the same highlighting as private in this ordering, with the responsible syntax definition updated or the issue redirected if it belongs in the linked repository.