The fix in the most recent push did not fix the issue: $ x=([9223372036854775805]=foo) $ x+=( {1..5} ) $ echo "${x[@]}" 3 4 5 foo 1 2
It behaves exactly the same way: no error is printed, some elements are prepended instead of appended, and there are invalid indices in the output of declare -p . I think the fix only makes bash error when you use +=(...) and, before the assignment, the max index of the array is already INT_MAX. What I would have expected was something like this: $ x=([9223372036854775805]=foo) $ x+=( {1..5} ); echo "this won't run" bash: some "invalid assignment" error $ declare -p x # no value gets appended since there was an error declare -a x=([9223372036854775805]="foo") o/ emanuele6