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#' @title Various 'Not Available' / Missing Values
#' @description R comes with several built-in NA constants, including `NA`
#' (logical), `NA_integer_`, `NA_real_`, `NA_complex_` and `NA_character_`.
#' Similarly, we can define NA values that are associated with other classes,
#' such as, `NA_Date_` and `NA_list_`.
#' @name na_utiles
#' @return Predefined constant.
NULL
# Atoms -------------------------------------------------------------------
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NA_numeric_ <- structure(NA_real_, class = c("integer", "numeric"))
# Timedate ----------------------------------------------------------------
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NA_Date_ <- structure(NA_real_, class = "Date")
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NA_POSIXct_ <- structure(.POSIXct(NA_real_, tz = "UTC"), class = c("POSIXct", "POSIXt"))
# Arrays ------------------------------------------------------------------
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NA_list_ <- structure(list(), class = "list")
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NA_data.frame_ <- structure(data.frame(), class = "data.frame")
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