Consider the following code:
f <- function(x)function(y){x+y}
all.equal(f(5), f(0))
This returns TRUE, when it should return FALSE; I think it’s hard to make the
case that f(5) and f(0) are “approximately equal” in any meaningful sense.
Digging into the code for all.equal(), I see that all.equal(f(5), f(0)) results
in a call to all.equal.language(f(5), f(0)), which only compares the function
texts for equality.
If it is decided to leave this behavior as-is, then at least it should be
documented. Currently I cannot find any documentation for all.equal applied to
functions.
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