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Kumar ShivenduandClaude Opus 5 83fe47c90a feat: add a dedicated min operator to score formulas (#10296)
Follow-up to #10287, which added `max`. Expressing a minimum still
required spelling out `(a + b - |a - b|) / 2`, the sign flip of the max
identity — drop the `neg` and you silently get a maximum instead. It also
only works for two operands and mentions each one twice, so the scorer
walks every sub-tree twice per candidate point.

The pair is what makes clamping expressible:

    {"max": [0.0, {"min": [1.0, "$score"]}]}

`min` mirrors `max` throughout, and both guard helpers introduced in
#10287 already took an `operator: &str`, so they are reused unchanged: an
empty operand list is rejected at parse time rather than folding to
+infinity, and the Edge FFI rejects it at construction time. The result
needs no `is_finite` check, since `min` cannot produce a non-finite value
from finite inputs.

The unindexed-field walker shares one arm for `Max | Min` as the bodies
are identical, with a test pinning `min` separately so a later split
cannot silently drop it.

Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>
2026-08-21 22:51:44 +05:30
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