Is a list an atomic object? (or is there an issue with the help page of ?tapply ?)

In the help page of ?tapply it says that the first argument (X) is "an
atomic object, typically a vector."

However, tapply seems to be able to handle list objects. For example:

###################

l <- as.list(1:10)
is.atomic(l) # FALSE
index <- c(rep(1,5),rep(2,5))
tapply(l,index,unlist)

tapply(l,index,unlist)

$`1`
[1] 1 2 3 4 5

$`2`
[1]  6  7  8  9 10


###################

Hence, does it mean a list an atomic object? (which I thought it wasn't) or
is the help for tapply needs updating?
(or some third option I'm missing?)

Thanks.





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