I studied the GM wiki, I studied this group, but I don't get it. To be 
honest: I never heared about this asynchron stuff until today.

I found here in this group

let sData = await GM.getValue("serialised") ; 
let oData = JSON.parse(sData) ;

but it does not work for me. Perhaps I have to declare or initialize 
"await" and "JSON", but I don't know.

Simple example:

GM.setValue("myvar", "foo");
var result = "empty";
var sData = await GM.getValue("myvar");
result = JSON.parse(sData);
alert(result);

What do I have to add and/or correct to get an alert which shows "foo"?

Thank you very much in advance for help. And whatever it is, it should be 
implemented in the GM wiki ASAP!

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