$ for s in bash /bin/bash; do
 for b in compopt help; do
  "$s" -c 'echo "$1" is $([[ $(type $1 2>/dev/null) =~ builtin ]] || echo not) a builtin in "$BASH_VERSION"' _ $b;
 done;
done
compopt is a builtin in 5.0.7(1)-release
help is a builtin in 5.0.7(1)-release
compopt is not a builtin in 3.2.57(1)-release
help is a builtin in 3.2.57(1)-release