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That MySQL puzzle is solved by adding backtrace to sed_diefatal(). Any more wishes?

OK, I've added a few simple functions which make manual debugging easier:

• sed_assert($var1,..) - use it to print variables on a blank screen immediately
• sed_backtrace() - prints backtrace (files, functions, parameters). By default blanks the screen, call sed_backtrace(FALSE) to see backtrace within normal output flow.
• sed_vardump() - attempts to print contents of all global variables recursively. Doesn't print all of them because it has length limitation. By default blanks the screen, call sed_vardump(FALSE) to see vardump within normal output flow.

sed_diefatal() was modified and a new option was added to config.php:
By default this switch is on. On some production sites you'd like to disable it because debug info contains file paths. When this switch is defined, sed_diefatal() prints backtrace. It is extremely useful to track MySQL errors.