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Calling param() in list context can lead to vulnerabilities if you do not sanitise user input as it is possible to inject other param keys and values into your code. This is why the multi_param() method exists, to make it clear that a list is being returned, note that param() can still be called in list context and will return a list for back compatibility. Source: http://search.cpan.org/~leejo/CGI-4.21/lib/CGI.pod#Fetching_the_value_or_values_of_a_single_named_parameter
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This fix #5