Write nullable types more concise way


#1

for example: with standart declaration:
var userName: String? = ""

to have a syntax like that
var userName ?= ""


#2

I do not believe that this pattern (a variable of a nullable type with a non-null initializer) comes up so often that it deserves special syntax in the language. (I can’t recall any situations where I would have needed something like that in my code).