[R-pkg-devel] data and load version 3

[Tomas Kalibera]

On 6/30/20 11:48 AM, Göran Broström wrote:
>
>
> On 2020-06-30 01:07, Jeff Newmiller wrote:
>> Your choice. Do you want to support people using older versions of R, 
>> or not?
>
> Is that all? No point at all with version 3 in packages? Why was it 
> introduced? I have seen an argument for version 2: "... needed ... to 
> support name spaces", but version 3 ...

Format 3 supports efficient serialization of ALTREP objects, that is why 
it was introduced. It also saves the session native encoding and 
converts string on de-serialization when running in different native 
encoding. Documented also in R 3.5 NEWS, in R Internals.

Tomas


>
> Göran
>
>>
>> On June 29, 2020 1:55:02 PM PDT, "Göran Broström" 
>> <goran.brostrom using umu.se> wrote:
>>> I added two data sets (.rda) to my package eha, but when I build the
>>> new
>>> version I get:
>>>
>>> WARNING: 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: ‘eha/data/swedeaths.rda’
>>> ‘eha/data/swepop.rda’
>>>
>>> In DESCRIPTION I have 'Depends: R (>= 3.0.0)'
>>>
>>> After googling for a while (found nothing relevant in 'WRE'), I
>>> understand that I have two options: (i) Change 'Depends' in DESCRIPTION
>>>
>>> as suggested, and (ii) using save with 'version = 2' for the new files.
>>>
>>> And, if I am recommended to choose (i), should I recreate the old data
>>> files with 'version = 3'?
>>>
>>> My guess is go for (i) and version = 3 for all data files, but I feel
>>> that I need advise.
>>>
>>> Thanks, Göran
>>>
>>> ______________________________________________
>>> R-package-devel using r-project.org mailing list
>>> https://stat.ethz.ch/mailman/listinfo/r-package-devel
>>
>
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