+class IA5String(AllowableCharsMixin, CommonString):
+ """IA5 string
+
+ Its value is properly sanitized: it is a mix of
+
+ * http://www.itscj.ipsj.or.jp/iso-ir/006.pdf (G)
+ * http://www.itscj.ipsj.or.jp/iso-ir/001.pdf (C0)
+ * DEL character (0x7F)
+
+ It is just 7-bit ASCII.
+
+ >>> IA5String().allowable_chars
+ frozenset(["NUL", ... "DEL"])
+ """