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This PR depends on PR #474. Only the last three commits properly belong to this PR. Please merge that one first so that we can rebase this one on top.Rebased.An implementation of
swap
. (Finally!)I was about to remove
examples/euclid-gcd.007
in accordance with the instructions in #194, but I discovered it can actually useswap
... so for now I kept it.Closes #218.