spec test index / oilshell.org
| case | bash | description |
| 0 | pass | declare -i |
| 1 | pass | append in arith context |
| 2 | pass | declare array vs. string: mixing -a +a and () '' |
| 3 | pass | declare array vs. associative array |
4 passed, 0 ok, 0 known unimplemented, 0 known bugs, 0 failed, 0 skipped