Is it usefull in Edge context to have in C# dictionary initializer more compatible with JS?

[comdiv]

Have post dotnet/roslyn#6965 that couse some discussion and holywars, while by it's motivated by using ElasticSearch, Mongo and some REST APIs from C# - may be it's concordant with Edge issues.

Idea is to supply dictioary literal that creates Dictionary<stirng,object> with syntax close to JS:

var d = {x:1, y:{z:2}, a:[1,2]};
//translated to
var d  = new Dictionary<string,object>{["x"] = 1,["y"]=new Dictionary<string,object>{["z"] = 2}, ["a"] = new List<object>{1,2}}