On 7/15/19 2:06 AM, Travers Ching wrote:
I think the major change was saving of alt-rep objects efficiently.
Example save(1:1e8, file=...) is very efficient.
I'm not sure if that is all that changed it, but I couldn't find
documentation on the differences.
Yes, format version 3 provides custom serialization for altrep objects,
so that it can e.g. serialize efficiently integer sequences. In
addition, it keeps record of the current native encoding when
serializing strings, so that it can convert strings with unflagged
encoding when de-serializing them with different native encoding. So for
example if a string with current native encoding X (not being latin1,
and indeed not UTF-8) on Windows gets serialized, and then de-serialized
on Linux running UTF-8 as current native encoding, it would be converted
to UTF-8. In previous versions, it would be misinterpreted.
Best
Tomas
For maximum compatibility in a package, personally I would use version 2.
On Sun, Jul 14, 2019 at 4:52 PM Rolf Turner <r.tur...@auckland.ac.nz> wrote:
In a package (say "clyde") that I am building I save a number of
datasets in clyde/data via something like:
save(melvin,file="~/<whatever>/clyde/data/melvin.rda")
When I build "clyde" I now get warnings like unto:
uWARNING: Added dependency on R >= 3.5.0 because serialized objects in
serialize/load version 3 cannot be read in older versions of R.
File(s) containing such objects: 'clyde/data/melvin.rda'
If I put the argument "version=2" into my save() call, the warnings go
away.
What are the implications of this?
What are the consequences/what is the downside of setting version=2?
What are the consequences/what is the downside of adding the dependency
on R >= 3.5.0 into my DESCRIPTION file?
Who gets shafted by each of these two possibilities?
Which is recommended?
Grateful for any pearls of wisdom.
cheers,
Rolf Turner
--
Honorary Research Fellow
Department of Statistics
University of Auckland
Phone: +64-9-373-7599 ext. 88276
______________________________________________
R-package-devel@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-package-devel
[[alternative HTML version deleted]]
______________________________________________
R-package-devel@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-package-devel
______________________________________________
R-package-devel@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-package-devel
