gofmt -l -s -w vtab/*.go

//     return of the method, directly (stored in a struct, map, channel, or

//     outer-scope variable) or indirectly (passed to anything that captures

//     them).

//

//   - Retaining a volatile argument produces silent data corruption: SQLite

//     reuses the underlying buffer for the next row, so a retained value

//     will later appear to hold a different row's bytes. The race detector

//     cannot catch this; callbacks run sequentially on a single goroutine.

//

//   - To keep a value across rows, copy it:

//

//     saved := append([]byte(nil), v.([]byte)...)             // BLOB