As a matter of fact, even the current version of allowing 2 digits is probably not an e164 number. The only country code that is one digit is US/Canada with '1', but then there is no real number in their numbering plan with just a single digit after the country code.

The patch for the code is to a part where it checks that the length is sufficient to be sure that accessing the char at position 0 (first char) is safe and it is '+'. Because after that is a FOR loop starting at positing 1 (second char) to see if there are digits.

It might be useful to add min/max_length restrictions, but is more or less not related to this patch (or better said, not only related to this part). That could be an enhancement.

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