You can clone with
In user_guide/libraries/trackback.html in the section "Creating a Trackback Table" the ip_address element is only a varchar(16). To make this IPv6 compatible this should be varchar(39). No other changes needed.
Being handled in #1720
fix issue #1719 and update ip address length on captcha helper
Signed-off-by: Bo-Yi Wu <email@example.com>