Optimized concat.

Author Pascal J. Bourguignon <pjb@informatimago.com>
Author date 2018-12-02 11:18:53
Author local date 2018-12-02 12:18:53 +0100
Committer Pascal J. Bourguignon <pjb@informatimago.com>
Committer date 2018-12-02 11:18:53
Committer local date 2018-12-02 12:18:53 +0100
Commit 3143053183284fe980599af26991c36e191a868a
Tree 93cc60f366c8e409e6dc415cc7573fadea9c30a7
Parent 998232662d5a6586115f9ad62481edc2b9e7ea5a
Optimized concat.
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