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

[Göran Broström]

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 ...

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
>>
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>