Internal error when adding polyline from variables

[actech]

Use old type variables that can be obtained from the function block to which the parameters are added.

Polylines from JSON string?

To improve your mood, a simple example with JSON data for a polyline. I also show the magic of turning a string into a numeric type. [%D0%B8%D0%B7%D0%BE%D0%B1%D1%80%D0%B0%D0%B6%D0%B5%D0%BD%D0%B8%D0%B5]