R Under development (unstable) (2023-11-16 r85542 ucrt) -- "Unsuffered Consequences"
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> library("R.utils")
Loading required package: R.oo
Loading required package: R.methodsS3
R.methodsS3 v1.8.2 (2022-06-13 22:00:14 UTC) successfully loaded. See ?R.methodsS3 for help.
R.oo v1.25.0 (2022-06-12 02:20:02 UTC) successfully loaded. See ?R.oo for help.

Attaching package: 'R.oo'

The following object is masked from 'package:R.methodsS3':

    throw

The following objects are masked from 'package:methods':

    getClasses, getMethods

The following objects are masked from 'package:base':

    attach, detach, load, save

R.utils v2.12.3 successfully loaded. See ?R.utils for help.

Attaching package: 'R.utils'

The following object is masked from 'package:utils':

    timestamp

The following objects are masked from 'package:base':

    cat, commandArgs, getOption, isOpen, nullfile, parse, warnings

> 
> # - - - - - - - - - - - - - - - - - - - - - - - - - -
> # Simulate two large named logical vectors,
> # one with missing values one without
> # - - - - - - - - - - - - - - - - - - - - - - - - - -
> N <- 1e5
> 
> # Vector #1
> x <- sample(c(TRUE, FALSE), size=N, replace=TRUE)
> names(x) <- seq_along(x)
> 
> # Vector #2
> y <- x
> y[sample(N, size=0.1*N)] <- NA
> 
> 
> # Validate consistency
> stopifnot(identical(which(x), whichVector(x)))
> stopifnot(identical(which(y), whichVector(y)))
> 
> 
> # A matrix
> x <- t(x)
> stopifnot(identical(which(x), whichVector(x)))
> 
> proc.time()
   user  system elapsed 
   0.37    0.14    0.45