Log Message:
(math/R-tidyr) Updated 1.2.1 to 1.3.0

# tidyr 1.3.0

## New features

* New family of consistent string separating functions:
  `separate_wider_delim()`, `separate_wider_position()`,
  `separate_wider_regex()`, `separate_longer_delim()`, and
  `separate_longer_position()`. These functions are thorough refreshes of
  `separate()` and `extract()`, featuring improved performance, greater
  consistency, a polished API, and a new approach for handling problems. They
  use stringr and supersede `extract()`, `separate()`, and `separate_rows()`
  (#1304).

* `nest()` gains a `.by` argument which allows you to specify the columns to
  nest by (rather than the columns to nest, i.e. through `...`). Additionally,
  the `.key` argument is no longer deprecated, and is used whenever `...` isn't
  specified (#1458).

* `unnest_longer()` gains a `keep_empty` argument like `unnest()` (#1339).

* `pivot_longer()` gains a `cols_vary` argument for controlling the ordering of
  the output rows relative to their original row number (#1312).

* New datasets `who2`, `household`, `cms_patient_experience`, and
  `cms_patient_care` to demonstrate various tidying challenges (#1333).

## Breaking changes

* The `...` argument of both `pivot_longer()` and `pivot_wider()` has been
  moved to the front of the function signature, after the required arguments
  but before the optional ones. Additionally, `pivot_longer_spec()`,
  `pivot_wider_spec()`, `build_longer_spec()`, and `build_wider_spec()` have
  all gained `...` arguments in a similar location. This change allows us to
  more easily add new features to the pivoting functions without breaking
  existing CRAN packages and user scripts.

  `pivot_wider()` provides temporary backwards compatible support for the case
  of a single unnamed argument that previously was being positionally matched to
  `id_cols`. This one special case still works, but will throw a warning
  encouraging you to explicitly name the `id_cols` argument.

  To read more about this pattern, see
  [Data, dots, details](https://design.tidyverse.org/dots-position.html) in the
  tidyverse design guide (#1350).

## Lifecycle changes

* All functions deprecated in tidyr 1.0 and 1.2 (the old lazyeval functions
  ending in `_` and various arguments to `unnest()`) now warn on every use.
  They will be made defunct in 2024 (#1406).

## Rectangling

* `unnest_longer()` now consistently drops rows with either `NULL` or empty
  vectors (like `integer()`) by default. Set the new `keep_empty` argument to
  `TRUE` to retain them. Previously, `keep_empty = TRUE` was implicitly being
  used for `NULL`, while `keep_empty = FALSE` was being used for empty vectors,
  which was inconsistent with all other tidyr verbs with this argument (#1363).

* `unnest_longer()` now uses `""` in the index column for fully unnamed
  vectors. It also now consistently uses `NA` in the index column for empty
  vectors that are "kept" by `keep_empty = TRUE` (#1442).

* `unnest_wider()` now errors if any values being unnested are unnamed and
  `names_sep` is not provided (#1367).

* `unnest_wider()` now generates automatic names for _partially_ unnamed
  vectors. Previously it only generated them for fully unnamed vectors,
  resulting in a strange mix of automatic names and name-repaired names (#1367).

## Bug fixes and minor improvements

### General

* Most tidyr functions now consistently disallow renaming during tidy-selection.
  Renaming was never meaningful in these functions, and previously either had no
  effect or caused problems (#1449, #1104).

* tidyr errors (including input validation) have been thoroughly reviewed
  and should generally be more likely to point you in the right direction
  (#1313, #1400).

* `uncount()` is now generic so implementations can be provided for objects
  other than data frames (@mgirlich, #1358).

* `uncount()` gains a `...` argument. It comes between the required and the
  optional arguments (@mgirlich, #1358).

* `nest()`, `complete()`, `expand()`, and `fill()` now document their support
  for grouped data frames created by `dplyr::group_by()` (#952).

* All built in datasets are now standard tibbles (#1459).

* R >=3.4.0 is now required, in line with the tidyverse standard of supporting
  the previous 5 minor releases of R.

* rlang >=1.0.4 and vctrs >=0.5.2 are now required (#1344, #1470).

* Removed dependency on ellipsis in favor of equivalent functions in rlang
  (#1314).

### Nesting, packing, and chopping

* `unnest()`, `unchop()`, `unnest_longer()`, and `unnest_wider()` better handle
  lists with additional classes (#1327).

* `pack()`, `unpack()`, `chop()`, and `unchop()` all gain an `error_call`
  argument, which in turn improves some of the error calls shown in `nest()`
  and various `unnest()` adjacent functions (#1446).

* `chop()`, `unpack()`, and `unchop()` all gain `...`, which must be empty
  (#1447).

* `unpack()` does a better job of reporting column name duplication issues and
  gives better advice about how to resolve them using `names_sep`. This also
  improves errors from functions that use `unpack()`, like `unnest()` and
  `unnest_wider()` (#1425, #1367).

### Pivoting

* `pivot_longer()` no longer supports interpreting `values_ptypes = list()`
  and `names_ptypes = list()` as `NULL`. An empty `list()` is now interpreted as
  a `<list>` prototype to apply to all columns, which is consistent with \ 
how any
  other 0-length value is interpreted (#1296).

* `pivot_longer(values_drop_na = TRUE)` is faster when there aren't any missing
  values to drop (#1392, @mgirlich).

* `pivot_longer()` is now more memory efficient due to the usage of
  `vctrs::vec_interleave()` (#1310, @mgirlich).

* `pivot_longer()` now throws a slightly better error message when
  `values_ptypes` or `names_ptypes` is provided and the coercion can't be made
  (#1364).

* `pivot_wider()` now throws a better error message when a column selected by
  `names_from` or `values_from` is also selected by `id_cols` (#1318).

* `pivot_wider()` is now faster when `names_sep` is provided (@mgirlich, #1426).

* `pivot_longer_spec()`, `pivot_wider_spec()`, `build_longer_spec()`, and
  `build_wider_spec()` all gain an `error_call` argument, resulting in better
  error reporting in `pivot_longer()` and `pivot_wider()` (#1408).

### Missing values

* `fill()` now works correctly when there is a column named `.direction` in
  `data` (#1319, @tjmahr).

* `replace_na()` is faster when there aren't any missing values to replace
  (#1392, @mgirlich).

* The documentation of the `replace` argument of `replace_na()` now mentions
  that `replace` is always cast to the type of `data` (#1317).