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See the original description in base::isFALSE.
base::isFALSE
isFALSE(x)
# get function from namespace instead of possibly getting # implementation shipped with recent R versions: bp_isFALSE = getFromNamespace("isFALSE", "backports") bp_isFALSE(FALSE) bp_isFALSE(iris)
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