spec test index / oilshell.org
| case | bash | osh | osh_ALT | description |
| 0 | pass | pass | pass | type -t builtin -> function |
| 1 | pass | pass | pass | type -t builtin -> builtin |
| 2 | pass | pass | pass | type -t builtin -> keyword |
| 3 | pass | pass | pass | type -t builtin -> file |
| 4 | pass | pass | pass | type -t builtin -> not found |
15 passed, 0 ok, 0 known unimplemented, 0 known bugs, 0 failed, 0 skipped