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#618 alternative to dupn #2059

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@wtlangford @nicowilliams It's old, I know, but why not?

Following my comments at #618 I am proving here my points.

The suggested FORK_1N would need to pop/push for the first time and then produce null after backtrack, so that the second branch has some input to consume. Hence a small change in the proposed naming.

Or, alternatively, we could introduce at least one instruction which produces value but doesn't consume one. This would come in handy in many places - maybe some kind of a modifier for existing opcodes. Just saying...

All tests pass.

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Coverage Status

Coverage decreased (-0.4%) to 84.075% when pulling 145848f on leonid-s-usov:618-alternative-to-DUPN into 5b9e63e on stedolan:master.

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