ddekany commented on PR #97:
URL: https://github.com/apache/freemarker/pull/97#issuecomment-1784898441
Earlier we weren't assuming that the sizes won't change between the
concatenation and the iteration; the concatenated sequences is just a "view". I
know that happens almost never in practice, but still, this should be at least
{{incompatibleImprovements}}-dependent behavior, as it's not backward
compatible, and the old behavior is not bug (but a bad design decision). Also,
if from now on we do assume that the size of underlying sequences won't change,
then certainly there's a more efficient solution (like where reading the 1st
element is not O(N), but O(log2(N))).
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