isNaOrNanScalarOrNull(NA)
# returns TRUE (argument is valid)
isNaOrNanScalarOrNull("X")
# returns FALSE (argument is invalid)
#isNaOrNanScalarOrNull("X", stopIfNot = TRUE)
# throws exception with message defined by message and argumentName parameters
isNaOrNanScalarOrNull(NA, default = NaN)
# returns NA (the argument, rather than the default, since it is not NULL)
#isNaOrNanScalarOrNull("X", default = NaN)
# throws exception with message defined by message and argumentName parameters
isNaOrNanScalarOrNull(NULL, default = NaN)
# returns NaN (the default, rather than the argument, since it is NULL)
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