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I tried with various versions of "foobar" or foobar without the quotes

Interesting is the code points to the 'o' and not f .. I even tried setting "false" and then the code complains about false being boolean and my target go type is a string

Not so "fun fact", when I change my code from config.RequireObject to foo := config.Require it works ..

That sounds odd. Would you mind opening a bug with a repro.

`config.require` does return a string. `requireObject` will read the string value and attempt to unmarshal it into the provided interface (a string in your case). I image that you probably want `require`  in this case