@denisjacquemin: historically, for(x in y) will show "toString" as a value of "x". using hasOwnProperty allows for skipping over "built in" or "metadata" properties, and just evaluate "value" properties.
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@denisjacquemin: historically, for(x in y) will show "toString" as a value of "x". using hasOwnProperty allows for skipping over "built in" or "metadata" properties, and just evaluate "value" properties.