Passing boolean parameter in ruby

I am wondering how do I pass a false value to my ruby script.

If I invoke:

ruby myscript.rb false

and then in my script if I say:

my_class.new(*ARGV)or my_class.new(ARGV[0])

basically a string with value "false" gets passed. Clearly if I say

if(ARGV[0]){ do something} .. this gets executed even if value passed is false. 

Can I change my function signature to auto-covert paramter to boolean ..so that I dont have to do

if(ARGV[0]=='true')