On Tue, Apr 10, 2018 at 1:32 AM Alex Dvoretskiy <advoretski...@gmail.com>

> Why there is no difference if the last comma exists?

Because the language specification allows to omit the last comma before the
closing '}':

        LiteralValue = "{" [ ElementList [ "," ] ] "}" .

See: https://golang.org/ref/spec#LiteralValue



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