r - 用羽毛书写和阅读后，带有日期列的 Tibble 与自身不同

Question

让我们考虑一下 tibble

x <- tibble::tibble(start_date = lubridate::ymd(NA, NA, "2016-01-01", "2018-04-01", NA))

显然它与自身相同

testthat::expect_identical(x, x)

但是，如果我将文件写入磁盘然后读取它，则会出现错误

library(feather)
write_feather(x, "x.feather")
x_feather <- read_feather("x.feather")
system("rm x.feather")
testthat::expect_identical(x, x_feather)

# Error: `x` not identical to `x_feather`.
# Rows in x but not y: 1. Rows in y but not x: 1.