If this was put into beta today in Python, it would probably get a 6kyu rating...

Correct, it shouldn't really show up in the description when you are solving in a different language... But it is quite common that you see something like "if string is empty return false (null in null-lang, 0 in 0-lang)" etc.

Haskell is a computer programming language, the comments are to exclude the Haskell implementation from certain attributes mentioned.

The DNA of a Haskell has been discovered not to be a string but a list of bases, but better research is still required.

No help here?

What part do you want explanation on?

The source of the problem seems to be elsewhere, when you use the function gettype with the operator !==. Check the documentation to see how they are supposed to work.

smashes that best practices button

username = EPiph123

In case anyone has the same problem, it seems that by design they call the function without any arguments, you have to somehow figure out how to deal with that. Sucks it isn't mentioned in the description.

How do I pass with PHP?

On receiving a string if I return null I get this message:

Your function should return false when a string is provided

Failed asserting that null is false.

Changing it to false and it throws this:

ArgumentCountError : Too few arguments to function f(), 0 passed

in /workspace/default/tests/FTest.php on line 9 and exactly 1 expected

You have to return the value, not print it to console. (Although you can print to console as well if you like). Google how to return a value from a function in Python.

In the future don't tag a question as an issue... :)

The tests must have changed, because this doesn't pass anymore...

I actually wasn't notified about these messages... so only seeing them now...

Sorry if I closed your issue without too much of an explanation yesterday, I thought what I said would be enough to point the right direction. I only recently got the privilege to close issues.