- Output for 7.0.0 - 7.2.0
- string(4) "\x{}" string(4) "\xZZ" string(3) "\xg" string(2) "\u" string(6) "\u9999" string(3) "香"
- Output for 5.3.18 - 5.6.28
- string(4) "\x{}" string(4) "\xZZ" string(3) "\xg" string(2) "\u" string(6) "\u9999" string(8) "\u{9999}"
