Quoth Mark Wardle on Prickle-Prickle, Chaos 14, 3174:
> I can see that f(b <- 10) is equivalent to f(assign("b"), 10))
f(assign("b", 10))?
My undestanding is that assign applies to the parental environment;
but the return value of assign, namely 10, is passed to f as the local
variable a.
The default value b = 4 then overrides the parental environment since
it is unspecified in the call to f.
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