Here’s a tiny bug! The Phone Number exercise’s instructions say that, “The format is usually represented as (NXX)-NXX-XXXX”, but that’s not really the case. According to Wikipedia, and backed up by my personal observation, “NANP telephone numbers are usually written as NPA-NXX-XXXX or (NPA) NXX-XXXX” Note that the NPA is either in parentheses or separated by a dash, but not both.
Thanks. I opened a PR :)