RSC preview doesn't work with difftime columns

[hadley]

library(pins)
board <- board_rsconnect()
#> Connecting to RSC 1.9.0.1 at <https://connect.rstudioservices.com>
df <- data.frame(x = Sys.time())
df$y <- df$x - Sys.time()

board %>% pin_write(df, "test")
#> Guessing `type = 'rds'`
#> Error: No method asJSON S3 class: difftime

^{Created on 2021-09-07 by the reprex package (v2.0.0)}

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