class Puma::UserFileDefaultOptions

def all_of(key)
  user    = user_options[key]
  file    = file_options[key]
  default = default_options[key]
  user    = [user]    unless user.is_a?(Array)
  file    = [file]    unless file.is_a?(Array)
  default = [default] unless default.is_a?(Array)
  user.compact!
  file.compact!
  default.compact!
  user + file + default
end