node.stripdebug([level[, function]]). * level: 1 don't discard debug * 2 discard Local and Upvalue debug info * 3 discard Local, Upvalue and lineno debug info. * function: Function to be stripped as per setfenv except 0 not permitted. * If no arguments then the current default setting is returned. * If function is omitted, this is the default setting for future
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