Pass-through marker on the pulling piston's sign - #1385
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An item that reaches a filtered output it does not match stops there, so every filtered piston acts as a wall and filters can only sit on the edges of a network, each with plain glass routed around it. Writing 'pass', 'bypass' or 'b' on the first line of the pulling piston's sign makes that pull pass-through: unmatched items continue past filtered outputs and find their own. Unmarked pipes behave exactly as before.
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The other half of the filtering chat, so you can see it and decide.
An item that reaches a filtered output it does not match stops there, so every filtered piston acts as a wall. In practice filters can only sit on the edges of a network with plain glass routed around each one, and compact sorting rooms with differently filtered pistons in the middle of a line are impossible.
Writing 'pass', 'bypass' or 'b' on the first line of the pulling piston's sign makes that pull pass-through: unmatched items continue past filtered outputs until they find their own. Unfiltered outputs still accept everything, so an unmarked network behaves exactly as before, and so does everything else, this only changes pulls whose piston opts in on its own sign.
The diff is mostly indentation from putting the deposit branches in an else, easier to read with whitespace hidden. Fine to close if you'd rather leave filtering alone.