inputs <- list(arg1 = "a", arg2 = "b")
# splice() concatenates the elements of inputs with arg3
splice(inputs, arg3 = c("c1", "c2")) %>% str()
list(inputs, arg3 = c("c1", "c2")) %>% str()
c(inputs, arg3 = c("c1", "c2")) %>% str()
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