Nothing
test_that("flattening", {
x <- list(test = data.frame(foo = 1:3))
x$test$bar <- data.frame(x = 5:3, y = 7:9)
expect_equal(x, fromJSON(toJSON(x), flatten = FALSE))
expect_equal(names(fromJSON(toJSON(x), flatten = TRUE)$test), c("foo", "bar.x", "bar.y"))
})
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