[1] 
> An overflow is an attempt to compute a value that exceeds the maximum
value of an integer variable.

;; [2] 
[CITE@en[RFC 3492 - Punycode: A Bootstring encoding of Unicode for Internationalized Domain Names in Applications (IDNA)]] 
<http://tools.ietf.org/html/rfc3492#page-4>

- [3] [[桁溢れ問題]]
-- [[日時桁溢れ問題]]
- [4] [[固定長]]
- [[値域]]