The parser in Z-machine games comes from the game, not from the runtime, so the Z-machine version is completely irrelevant and the only reason porting to Inform 6 would make a difference is that you'd be linking it with a different parser.

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anthk a day ago | parent [-]

Woudn't a Z8 game have an improved parser over a V5 one?

	▲	direwolf20 a day ago \| parent [-]
		No because the parser is part of the game, not the runtime