URI::Generic#check_port

# File tmp/rubies/ruby-4.0.0/lib/uri/generic.rb, line 697
def check_port(v)
  return v unless v

  if @opaque
    raise InvalidURIError,
      "cannot set port with registry or opaque"
  elsif !v.kind_of?(Integer) && parser.regexp[:PORT] !~ v
    raise InvalidComponentError,
      "bad component(expected port component): #{v.inspect}"
  end

  return true
end