[R] "each" argument in rep (Bug?)

[T.D. Rudolph]

I have a vector of unique elements that I want to replicate a variable number
of times depending on the element (lengths all > 800).  However I noticed
that the resulting length was not the sum of the each argument.  The
following example demonstrates this. 

I am confused as to why this works: 

rep(1:4, c(2,1,2,1)) 
[1] 1 1 2 3 3 4 

but this doesn't: 

rep(1:3, each=c(2,1,2)) 
[1] 1 1 2 2 3 3 

This does not appear to be consistent with the description provided in
?rep....   
Is this supposed to be happening? 
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