One reason to use Symbols is that they are immutable. When you're
passing one around as an argument or Hash key, it won't change.
Another is that multiple instances of a Symbol are the same object,
making a smaller memory footprint than Strings.
A string is not a symbol. Some structures will use to_s or to_sym to
allow you to pass either as an argument, but that's not their default
behaviour.
> {'a'=>1,:a=>2}
=> {"a"=>1, :a=>2}
> {'a'=>1,'a'=>2}
=> {"a"=>2}
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