next currently calls up multiple times depending on the execution path, which in turn results in multiple calls to make-node. While this doesn't make a substantial difference to the performance of vector-zip, custom zippers in which make-node is more expensive benefit from removing the redundant calls.
next
currently callsup
multiple times depending on the execution path, which in turn results in multiple calls tomake-node
. While this doesn't make a substantial difference to the performance ofvector-zip
, custom zippers in whichmake-node
is more expensive benefit from removing the redundant calls.