Is there a way to pass a modified argument from an S3 generic to a method?  
Here's a non-working example that I want to return "abcd".

  test <- function(x, y = NULL){
    y <- "abcd"
    UseMethod("test")
  }
  test.default <- function(x, y = NULL) y
  test(x = 3)

Is that possible? I've looked around a lot, but can't find any examples or 
discussion.

Jay

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