bash 4.4 and BASHOPTS containing extdebug in env

[Grisha Levit]

This seems new for 4.4.  Having extdebug in BASHOPTS seems to change the invocation behavior to mimic that of having specified the --debugger option, which I don't think is usually the intention:

$ shopt -s extdebug; export BASHOPTS

$ bash -c 'echo $BASH_VERSION; shopt -p extdebug'

4.3.42(1)-release

shopt -s extdebug

However, in 4.4:

$ shopt -s extdebug; export BASHOPTS

$ bash -c 'echo $BASH_VERSION; shopt -p extdebug'

bash: /Users/levit/utils/stow/bash/share/bashdb/bashdb-main.inc: No such file or directory

bash: warning: cannot start debugger; debugging mode disabled

4.4.0(3)-rc2

shopt -u extdebug