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This seems to be required for the HL-L2350DW, and matches the behaviour of the official driver.
Without this, if duplex is disabled then the printer still duplexes, but every other page is garbled.
I haven't tested this on any other printers. I think this should be safe (it's a standard PCL code), but it might be worth testing against other printers.
I'm using @QORTEC's master branch, but that shouldn't make any difference as the only changes are printer definitions.