Even when I had default = Some(true), the value was false unless the the flag was present. I don't the scallop supports defaults for boolean options. https://github.com/scallop/scallop/wiki/Option-types-and-definitions: "Special case of plain options are the flag options. They take no arguments, and evaluate to true if option was present on the command line or to false if it was not"

we could still add the default as documentation, but I think a comment would be better because then it wouldn't look like it was actually doing something.