Set a default encoding so that mu_pp doesn't raise an error. - #12
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When
Encoding.default_externalisnil(which it is in Opal by default),mu_ppraises an error, e.g. when pretty-printing a value in a failed assertion message. I don't know why Opal doesn't set this by default (e.g. from the document encoding); might be a bug. We can remove this line if that changes.