Comments (2)
All of the validation that file
(and all other type conversions) does is performed on values provided. They are deliberately orthogonal to validation the presence of the value on the command line. For that, you can use functions like multiple
, required
, and default
. You wouldn't want a type conversion to prevent you from customizing that behavior.
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Ah, I missed that there is such a thing as required
. This makes sense. Thanks!
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