Override a function that is imported in a namespace

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I’m stumped – I can’t figure out how plot.gam is locating termplot – it’s not using the ordinary scoping rules as far as I can tell. This seems to need a deeper understanding of namespaces than I currently possess.

my.termplot <- function (x) print("my new termplot")

# where is it defined?
getAnywhere("termplot")
# in package and in namespace

unlockBinding("termplot", as.environment("package:stats"))
assign("termplot", my.termplot, "package:stats")

unlockBinding("termplot", getNamespace("stats"))
assign("termplot", my.termplot, getNamespace("stats"))

getAnywhere("termplot")[1]
getAnywhere("termplot")[2]
# now changed in both places

y <- 1:10
x <- 1:10 + runif(10)
xx <- lm(y ~ x)
termplot(xx) # works

library("mgcv")
b <- gam(y ~ s(x), data = data.frame(x, y))
plot(b) # still calls the old termplot

# I'm mystified - if try and find termplot as
# seen from the environment of plot.gam, it looks 
# like what we want
get("termplot", environment(plot.gam))

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