JSON serialization of objects containing tuples

[Stefan_Salewski]

Ah, I took the import statement from the example, seem JsonUtils was missing. 
With
    
    
    import std/[strtabs,json, jsonutils]
    
    
    Run

I get
    
    
    
{"lines":[],"circs":[],"texts":[],"rects":[],"pads":[],"paths":[],"pins":[],"traces":[],"p":[],"at":[],"hover":false,"selected":false,"gx":0,"gy":0,"isNew":false}
    
    
    Run