Input years are not preserved in Epw$set()

[hongyuanjia]

library(eplusr)
data <- qs::qread("data.qs")
data[, .(year)]
#>       year
#>    1: 1989
#>    2: 1989
#>    3: 1989
#>    4: 1989
#>    5: 1989
#>   ---     
#> 8756: 1990
#> 8757: 1990
#> 8758: 1990
#> 8759: 1990
#> 8760: 1990
epw <- read_epw("SGP_Singapore.486980_IWEC.epw")
epw$set(data)
#> -- Info ------------------------------------------------------------------------
#> Data period #1 has been replaced with input data.
#> 
#>      Name StartDayOfWeek StartDay EndDay
#>  1:  Data         Sunday     1/ 1  12/31
#> --------------------------------------------------------------------------------
epw$data()[, .(year)]
#>       year
#>    1:    9
#>    2:    9
#>    3:    9
#>    4:    9
#>    5:    9
#>   ---     
#> 8756:    9
#> 8757:    9
#> 8758:    9
#> 8759:    9
#> 8760:    9

^{Created on 2020-09-05 by the reprex package (v0.3.0)}