Erlang DNS解析顺序问题

This leaves us some other alternatives:
1) To extend the 'file' or the 'dns' lookup
methods with IP string detection.
2) To do only do IP string detection when the 'native'
lookup method is not used, but to do it first instead
of last as today, within the inet:gethostbyname
lookup method wrapper itself.
3) To introduce a new lookup method e.g 'ipstring' that the
user can insert in the lookup chain wherever suitable.

I do not like 1) since it would make either of those
lookup methods impure, harder to test and harder to explain.

I prefer 2) because it would behave kind of natural.

However, 3) is the purest but would require manual
configuration in more cases.

But 2) wins...
At least until someone convinces me otherwise.