Line casing opacity

Hi,

We are currently working on a new design in our company and achieve a design similar to this.
The reasons are that :

• it will make street names visible
• Make bike lanes visible and not covered by the line

in Mapbox Navigation 2.0 we can indeed provide a color for the casing but since it's a wider line below the other one having a full opaque casing isn't possible like in the screenshot below.

Will there be a possibility to achieve something like this in the future?

Also, while playing with the opacity in navigation, I get those artifacts :

Would it make sense to have the ability to set the lineCap and lineJoin to avoid this effect?

Thank you very much in advance

Non viene indicato alcun file, test o punto di ingresso. Inizia riproducendo gli artefatti di opacità di line-casing riportati negli screenshot e traccia il percorso di rendering della navigazione; il lavoro sarebbe completato solo con un ambito definito e verificabile per translucent casing e il supporto di lineCap o lineJoin.