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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[BUG] math.round incorrectly uses HALF_EVEN instead of HALF_UP","articleBody":"\n\n**Describe the bug**\n`math.round` uses `HALF_EVEN` (banker's rounding) internally, but cel-java's own function declaration, cel-go's reference implementation, and cel-cpp's reference implementation all specify \"ties round away from zero\". cel-java is the outlier among the three official reference clients; `math.round` should instead use `HALF_UP`\n\n**To Reproduce**\nCheck which components this affects:\n\n- [ ]  parser\n- [ ]  checker\n- [x]  runtime\n\nSample expression and input that reproduces the issue:\n```cel\n// sample expression string\nmath.round(42.5) == 42.0 // should be 43.0\n```\n\nFix is at https://github.com/google/cel-java/pull/1054","author":{"url":"https://github.com/rayokota","@type":"Person","name":"rayokota"},"datePublished":"2026-05-14T19:30:02.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/1055/cel-java/issues/1055"}