Description:
------------
The flag FILTER_FLAG_NO_RES_RANGE for IPv6 is working internally with strncasecmp and does not take into account, that IPv6 addresses may be shortened by removing leading zeros.

line 900ff of ext/filter/logical_filters.c:
(Z_STRLEN_P(value) >= 9 &&  !strncasecmp("2001:0db8", Z_STRVAL_P(value), 9)) ||
(Z_STRLEN_P(value) >= 2 &&  !strncasecmp("5f", Z_STRVAL_P(value), 2)) ||
(Z_STRLEN_P(value) >= 4 &&  !strncasecmp("3ff3", Z_STRVAL_P(value), 4)) ||
(Z_STRLEN_P(value) >= 8 &&  !strncasecmp("2001:001", Z_STRVAL_P(value), 8))

Test script:
---------------
<?php

var_dump(filter_var('2001:0db8:0000:08d3:0000:8a2e:0070:7344', FILTER_VALIDATE_IP, FILTER_FLAG_NO_RES_RANGE));
var_dump(filter_var('2001:db8:0:8d3:0:8a2e:70:7344', FILTER_VALIDATE_IP, FILTER_FLAG_NO_RES_RANGE));

Expected result:
----------------
bool(false)
bool(false)

Actual result:
--------------
bool(false)
string(29) "2001:db8:0:8d3:0:8a2e:70:7344"