R Under development (unstable) (2024-01-07 r85787 ucrt) -- "Unsuffered Consequences"
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> if (require(RUnit)) {
+   library(FeatureHashing)
+   m1 <- hashed.model.matrix(~ ., iris, hash.size = 64, signed.hash = TRUE)
+   m2 <- hashed.model.matrix(~ ., iris, hash.size = 64, signed.hash = FALSE)
+   checkTrue(Reduce(`|`, as.matrix(m1) < 0))
+   for(j in 1:64) {
+     m1.sign <- sign(sum(m1[,j]))
+     checkEqualsNumeric(m1.sign * m1[,j], m2[,j])
+   }
+ }
Loading required package: RUnit
> 
> proc.time()
   user  system elapsed 
   1.59    0.25    1.82