.that(Ints.tryParse(Long.toString((long) LEAST - 1, radix), radix))
          .isNull();
    }
    assertWithMessage("Hex string and dec parm").that(Ints.tryParse("FFFF", 10)).isNull();
    assertWithMessage("Mixed hex case").that(Ints.tryParse("ffFF", 16)).isEqualTo(65535);
  }

  /**
   * Encodes an integer as a string with given radix, then uses {@link Ints#tryParse(String, int)}

  address ranges (“CIDR blocks”).
  
  In particular, octets within IPv4 addresses are not allowed to have any leading
  `0`s, and IPv4-mapped IPv6 values (e.g. `::ffff:192.168.0.1`) are forbidden.
  These sorts of values can potentially cause security problems when different
  components interpret the same string as referring to different IP addresses
  (as in CVE-2021-29923).
  

FFFC          ; disallowed                             # 2.1  OBJECT REPLACEMENT CHARACTER
FFFD          ; disallowed                             # 1.1  REPLACEMENT CHARACTER
FFFE..FFFF    ; disallowed                             # 1.1  <noncharacter-FFFE>..<noncharacter-FFFF>
10000..1000B  ; valid                                  # 4.0  LINEAR B SYLLABLE B008 A..LINEAR B SYLLABLE B046 JE