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Fix a regression with parsing multivalue options
By default, clap interprets ``` cargo run --bin foo bar baz ``` as ``` cargo run --bin foo --bin bar --bin baz ``` This behavior is different from docopt and does not play nicely with positional arguments at all. Luckily, clap has a flag to get the behavior we want, it just not the default! It will become the default in the next version of clap, but, until that time, we should be careful when using the combination of `.long`, `.value_name` and `.multiple(true)`, and don't forget to specify `.number_of_values(1)` as well.
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