`tile_tsibble` retains a partial window size, but `slide_tsibble` does not?

[cgoo4]

Is it an intentional difference in behaviour that tile_tsibble retains a partial window size, but slide_tsibble does not per the example below?

Ideally I'm looking for overlapping windows that retain a partial window.

library(tidyverse)
library(tsibble)
#> 
#> Attaching package: 'tsibble'
#> The following objects are masked from 'package:base':
#> 
#>     intersect, setdiff, union

tribble(
  ~group, ~date, ~value,
  "A", "2020-01-01", 1,
  "A", "2020-01-02", 2,
  "A", "2020-01-03", 3,
  "A", "2020-01-04", 4,
  "A", "2020-01-05", 5,
  "A", "2020-01-06", 6,
  "B", "2020-01-02", 2,
  "B", "2020-01-03", 3,
  "B", "2020-01-04", 4,
  "B", "2020-01-05", 5,
  "B", "2020-01-06", 6
) |>
  mutate(date = lubridate::ymd(date)) |> 
  as_tsibble(index = date, key = group) |>
  tile_tsibble(.size = 3)
#> # A tsibble: 11 x 4 [1D]
#> # Key:       .id, group [4]
#>    group date       value   .id
#>    <chr> <date>     <dbl> <int>
#>  1 A     2020-01-01     1     1
#>  2 A     2020-01-02     2     1
#>  3 A     2020-01-03     3     1
#>  4 B     2020-01-02     2     1
#>  5 B     2020-01-03     3     1
#>  6 B     2020-01-04     4     1
#>  7 A     2020-01-04     4     2
#>  8 A     2020-01-05     5     2
#>  9 A     2020-01-06     6     2
#> 10 B     2020-01-05     5     2
#> 11 B     2020-01-06     6     2

tribble(
  ~group, ~date, ~value,
  "A", "2020-01-01", 1,
  "A", "2020-01-02", 2,
  "A", "2020-01-03", 3,
  "A", "2020-01-04", 4,
  "A", "2020-01-05", 5,
  "A", "2020-01-06", 6,
  "B", "2020-01-02", 2,
  "B", "2020-01-03", 3,
  "B", "2020-01-04", 4,
  "B", "2020-01-05", 5,
  "B", "2020-01-06", 6
) |>
  mutate(date = lubridate::ymd(date)) |> 
  as_tsibble(index = date, key = group) |>
  slide_tsibble(.size = 3, .step = 3)
#> # A tsibble: 9 x 4 [1D]
#> # Key:       .id, group [3]
#>   group date       value   .id
#>   <chr> <date>     <dbl> <int>
#> 1 A     2020-01-01     1     1
#> 2 A     2020-01-02     2     1
#> 3 A     2020-01-03     3     1
#> 4 B     2020-01-02     2     1
#> 5 B     2020-01-03     3     1
#> 6 B     2020-01-04     4     1
#> 7 A     2020-01-04     4     2
#> 8 A     2020-01-05     5     2
#> 9 A     2020-01-06     6     2

^{Created on 2022-05-16 by the reprex package (v2.0.1)}

[cgoo4]

Will take a look at Slider