comparing two `Identifiers`

[flavluc]

Hello, I was using the lib and I came to a situation where I wanted to compare two strings and check if they are equal modulo casing. So I tried:

fromAny "hello_world" == fromAny "hello-world"  -- True

But if I do:

fromAny "hello_world" == fromAny "helloWorld"  -- False

It would be great if I'd have a True as a result in the last example as well. Checking the output of fromAny I have:

fromAny "hello_world"  -- Identifier {unIdentifier = ["hello","world"]}
fromAny "helloWorld"  -- Identifier {unIdentifier = ["hello","World"]}

So I suppose it's just a matter of changing the first letter to lowercase. I'm not really sure if this is the expected behavior or if it'll break anything. But in case this is a valid suggestion, please let me know, I don't mind making a PR =)