+.B safe64
+(Base64 encoding, with
+.RB ` - '
+instead of
+.RB ` + ',
+and
+.RB ` _ '
+instead of
+.RB ` / ',
+as specified in RFC3548, as an attempt to achieve the same goal but
+inconveniently using up all the good separator characters),
+.B base32
+(Base32 encoding, as described in RFC2938),