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sort: clarify Less doc #73421

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sort: clarify Less doc #73421

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7 changes: 3 additions & 4 deletions src/sort/sort.go
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Expand Up @@ -21,15 +21,14 @@ type Interface interface {
// Less reports whether the element with index i
// must sort before the element with index j.
//
// Less must satisfy strict weak ordering.
// https://en.wikipedia.org/wiki/Weak_ordering#Strict_weak_orderings
//
// If both Less(i, j) and Less(j, i) are false,
// then the elements at index i and j are considered equal.
// Sort may place equal elements in any order in the final result,
// while Stable preserves the original input order of equal elements.
//
// Less must describe a transitive ordering:
// - if both Less(i, j) and Less(j, k) are true, then Less(i, k) must be true as well.
// - if both Less(i, j) and Less(j, k) are false, then Less(i, k) must be false as well.
//
// Note that floating-point comparison (the < operator on float32 or float64 values)
// is not a transitive ordering when not-a-number (NaN) values are involved.
// See Float64Slice.Less for a correct implementation for floating-point values.
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