haven 2.5.0

New author

• @gorcha is now a haven author in recognition of his significant and sustained
  contributions.

File writing improvements

• All write_ functions can now write custom variable widths by setting the
  width attribute (#650).

• When writing files, the minimum width for character variables is now 1. This
  fixes issues with statistical software reading blank character variables with
  width 0 (#650).

• write_dta() now uses strL when strings are too long to be stored in an str#
  variable (#437). strL is used when strings are longer than 2045 characters by
  default, which matches Stata's behaviour, but this can be reduced with the
  strl_threshold argument.

• write_xpt() can now write dataset labels with the label argument, which
  defaults to the label attribute of the input data frame, if present (#562).

• write_sav() now checks for case-insensitive duplicate variable names
  (@juansebastianl, #641) and verifies that variable names are valid SPSS
  variables.

• The compress argument for write_sav() now supports all 3 SPSS compression
  modes specified as a character string - "byte", "none" and "zsav" (#614).
  TRUE and FALSE can be used for backwards compatibility, and correspond to
  the "zsav" and "none" options respectively.

• write_sav() successfully writes user missing values and ranges for
  labelled() integer vectors (#596).

• POSIXct and POSIXlt values with no time component (e.g. "2010-01-01") were
  being converted to NA when attempting to convert the output timezone to UTC.
  These now output successfully (#634).

• Fix bug in output timezone conversion that was causing variable labels and
  other variable attributes to disappear (#624).

Other improvements and fixes

• Updated to ReadStat 1.1.8 RC.

  • Fix bug when writing formats to XPT files (#650).
  • Fix off by one error in indexing for strL variables (#437).

• labelled() vectors now throw a warning when combining two vectors with
  conflicting labels (#667).

• zap_labels() gains a user_na argument to control whether user-defined
  missing values are converted to NA or left as is (#638).

• vctrs casting and coercion generics now do less work when working with two
  identical labelled() vectors. This significantly improves performance when
  working with labelled() vectors in grouped data frames (#658).

• Errors and warnings now use cli_abort() and cli_warning() (#661).

Dependency changes

• R 3.4 is now the minimum supported version, in line with tidyverse policy.

• cli >= 3.0.0 has been added to Imports to support new error messaging.

• lifecycle has been added to Imports, and is now used to manage deprecations.