I see this on MacOS as well, so likely not platform dependent.
A little more diddling to try to narrow it down:
unserialize(serialize(as.raw(1), NULL, version=2, ascii=TRUE))
[1] 30
unserialize(serialize(list(as.raw(1)), NULL, version=2, ascii=TRUE))
[[1]]
[1] 30
unserialize(serialize(list(raw=as.raw(1)), NULL, version=2, ascii=TRUE))
Error in unserialize(serialize(list(raw = as.raw(1)), NULL, version = 2, :
'installTrChar' must be called on a CHARSXP, but got 'pairlist'
unserialize(serialize(list(r=as.raw(1)), NULL, version=2, ascii=TRUE))
Error in unserialize(serialize(list(r = as.raw(1)), NULL, version = 2, :
'installTrChar' must be called on a CHARSXP, but got 'pairlist'
unserialize(serialize(list(r=1), NULL, version=2, ascii=TRUE))
$r
[1] 1
unserialize(serialize(list(as.raw(c(1,2))), NULL, version=2, ascii=TRUE))
[[1]]
[1] 30 31
So it looks like there is an issue with reading a named list containing a raw
vector. Unnamed lists work and so does non-raw vectors. The length of the
vector doesn't seem to matter and neither does the actual name.
You can vary the error message by varying the entries in the vector, but the
gist of it is that something gets misinterpreted and the rest of the data stop
making sense.
I also tried going explicitly through a text connection, and that seems exactly
equivalent.
-pd
On 7 Nov 2018, at 23:35 , Michael Sannella via R-devel <r-devel@r-project.org>
wrote:
I ran into an interesting error unserializing a file created with
ascii=TRUE:
R 3.5.1 (Windows or Linux):
unserialize(serialize(list(raw=as.raw(c(39,41))), NULL, version=2,
ascii=TRUE))
Error in unserialize(serialize(list(raw = as.raw(c(39, 41))), NULL,
version = 2, :
ReadItem: unknown type 29, perhaps written by later version of R
The same error happens when the serialization is done with version=2
or version=3. It does not happen if the serialization is done with
ascii=FALSE.
Note that 0x29 == 41. It looks like unserialize is reading the wrong
line.
I tried this in earlier versions of R on Windows, and the same error
happens in every version from R-2.15.3 (the earliest I have) on up.
~~ Michael Sannella
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