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Changes to src/sqlite.h.in.

  2697   2697   ** authorizer will fail with an error message explaining that
  2698   2698   ** access is denied. 
  2699   2699   **
  2700   2700   ** ^The first parameter to the authorizer callback is a copy of the third
  2701   2701   ** parameter to the sqlite3_set_authorizer() interface. ^The second parameter
  2702   2702   ** to the callback is an integer [SQLITE_COPY | action code] that specifies
  2703   2703   ** the particular action to be authorized. ^The third through sixth parameters
  2704         -** to the callback are zero-terminated strings that contain additional
  2705         -** details about the action to be authorized.
         2704  +** to the callback are either NULL pointers or zero-terminated strings
         2705  +** that contain additional details about the action to be authorized.
         2706  +** Applications must always be prepared to encounter a NULL pointer in any
         2707  +** of the third through the sixth parameters of the authorization callback.
  2706   2708   **
  2707   2709   ** ^If the action code is [SQLITE_READ]
  2708   2710   ** and the callback returns [SQLITE_IGNORE] then the
  2709   2711   ** [prepared statement] statement is constructed to substitute
  2710   2712   ** a NULL value in place of the table column that would have
  2711   2713   ** been read if [SQLITE_OK] had been returned.  The [SQLITE_IGNORE]
  2712   2714   ** return can be used to deny an untrusted user access to individual