[Help-bash] question about non-interactive shell mode

[MaShimiao]

Hi,all.
According to changelog, there is a shell's new feature about non-interactive 
mode.
It says non-interactive mode shells exit if -u is enabled and an attempt in 
made to use an unset variable with the % or # expansions, the '//', '^', or ',' 
expansion, or the parameter length expansion.

 "if -u is enabled", does it mean "shopt -u interactive_comments" or anything 
else?