haven 2.5.2

• Updated to ReadStat 1.1.9.

  • Fix various SAS catalog file reading bugs (#529, #653, #680, #696, #705).
  • Increase maximum SAS page file size to 16MiB (#697).
  • Ignore invalid SAV timestamp strings (#683).
  • Fix compiler warnings (#707).

• The experimental write_sas() function has been deprecated (#224). The
  sas7bdat file format is complex and undocumented, and as such writing SAS
  files is not officially supported by ReadStat. write_xpt() should be used
  instead - it produces files in the SAS transport format, which has
  limitations but will be reliably read by SAS.

• write_*() functions gain a new adjust_tz argument to allow more control
  over time zone conversion for date-time variables (#702). Thanks to @jmobrien
  for the detailed issue and feedback.

  Stata, SPSS and SAS do not have a concept of time zone. Since haven 2.4.0
  date-time values in non-UTC time zones are implicitly converted when writing
  to ensure the time displayed in Stata/SPSS/SAS will match the time displayed
  to the user in R (see #555). This is the behaviour when adjust_tz = TRUE
  (the default). Although this is in line with general user expectations it can
  cause issues when the time zone is important, for e.g. when looking at
  differences between time points, since the underlying numeric data is changed
  to preserve the displayed time. Use adjust_tz = FALSE to write the time as
  the corresponding UTC value, which will appear different to the user but
  preserves the underlying numeric data.

• write_*() functions previously returned the data frame with minor
  alterations made to date-time variables. These functions now invisibly return
  the original input data frame unchanged (@jmobrien, #702).

• Fix bug in string variable width calculation that treated NA values as width
  2. NA values are now treated as blanks for width calculations (#699).