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=== Custom
Sometimes you want to remove some blank arguments but not others, or perhaps you might want to put all of the positional arguments in lower case. To do things like this you can use the <code>valueFunc</code> option. The input to this option must be a function that takes two parameters, <code>key</code> and <code>value</code>, and returns the value of the argument. This function is called every time an argument is requested from the <code>args</code> table.
Example 1: this function preserves whitespace for the first positional argument, but trims all other arguments and removes all other blank arguments.
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