Where are usages like "== 2L" documented?

Patrick reminded me that it's also in The R Inferno, another document that I
need to read again.

So now, a more particular semi-question:

x <- 1L
y <- 1
z <- 1.0

class(x) # integer
class(y) # numeric
class(z) # numeric

x == 1
x == 1L
y == 1
z == 1 # all test TRUE

Just to clarify, I think the steps above prove it, but *in a test* like x ==
1 the test is for the contents, not the storage mode, not for a combination
of storage mode and contents.

So... The reason for defining the notion of "L" is smaller storage space,
and more generally, for use anytime one wants explictly an integer for
whatever reason?  Are there other reasons, for instance, ways it saves lines
of code?

Bryan
*************
Bryan Hanson
Acting Chair
Professor of Chemistry & Biochemistry
DePauw University, Greencastle IN USA