romainfrancois commented on pull request #10730:
URL: https://github.com/apache/arrow/pull/10730#issuecomment-908465941


   The `AltrepArrayPrimitive` class now marks the altrep object as immutable. 
This makes this "a bad idea" to call `
    Dataptr(writeable = TRUE)` on it, and it should rather be accessed 
read-only. 
   
   However, if we make this an error, this fails in many many places, including 
`identical()` so we can't do that. 


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