It is possible for a user to specify that an option would have a maximum and a minimum number of arguments. If a a client then entered a number of arguments mor than 0, but less than the number of defaults specified, it would only pick the values from the command line.
eg. Suppose programmer specifies 0 to 3 arguments and specifies tose default args to be 10, 20 and 30. Suppose further a user enters on the command line arguments of values 1 and 2. It would seem reasonable that the values picked up would be 1, 2 and 30. However it previously only picked the defaults if no arguments at all were submitted.
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