jonkeane commented on PR #45951:
URL: https://github.com/apache/arrow/pull/45951#issuecomment-2764733813

   > suggests using DATAPTR_RO instead of DATAPTR: 
https://cran.r-project.org/doc/manuals/r-devel/R-exts.html#Moving-into-C-API-compliance
   > 
   > Is that not an option for us?
   
   It is an option in one place and I did use it there, but not all: I would 
get segfaults/illegal access in the places that I didn't use it. If I'm reading 
the code correctly, those are places where we are actually mutating in place


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