| Value | Meaning |
|---|---|
| skip0 | Don't try to read file. |
| read1 | Try to read file. Give up on any error without throwing it. |
| throwReadError2 | Throw on file reading error. |
| throwParseError4 | Throw on file parsing error. |
| saveErrors8 | Save non-thrown errors to retrieve later via errors method. |
| optionalread | throwParseError | Read file if it's readable. Throw only on malformed contents. |
| requiredread | throwReadError | throwParseError | Always try to read file, throw on any error. |
| allowFailread | Don't throw if file can't be read or has invalid contents. |