they’re calling it the most subtle edge case ever

tayloraswift · tayloraswift · commit bae62e88c021 · 2026-02-26T05:45:36.000Z
diff --git a/Sources/Random/Binomial.swift b/Sources/Random/Binomial.swift
@@ -241,7 +241,7 @@ extension Binomial {
             } else {
                 // region 4: right exponential tail
                 let x: Double = envelope.r - Double.log(v) / λ.r
-                if  x > Double.init(Int64.max) {
+                if  x >= Double.init(Int64.max) {
                     continue
                 }
 

Original file line number	Diff line number	Diff line change
`@@ -241,7 +241,7 @@ extension Binomial {`
`241`	`241`	`} else {`
`242`	`242`	`// region 4: right exponential tail`
`243`	`243`	`let x: Double = envelope.r - Double.log(v) / λ.r`
`244`		`- if x > Double.init(Int64.max) {`
	`244`	`+ if x >= Double.init(Int64.max) {`
`245`	`245`	`continue`
`246`	`246`	`}`
`247`	`247`