The answer is a bit more detailed. The function’ user input box accept addresses “as they are” (without any double quote) up to two parameters, one of which is an address. After that, it requires to double quote at least from the second address.
On the other hand from the last version (0.7.5) if you write an address as parameter in any multiparameter function input space and then open the “column type” interface (just click on ^ sign in the input block) the system automatically copies the existing address add double quotes them automatically. So we can presume that double quotes are very probably ever well accepted.
Any valid address can be used. In particular if it is the single (or the first of the two) address of the function, it never requires double quote.