romainfrancois commented on pull request #7819:
URL: https://github.com/apache/arrow/pull/7819#issuecomment-677564052
Looks like this is related to how `cpp11` treats `uintptr_t`:
```cpp
uintptr_t allocate_arrow_schema();
extern "C" SEXP _arrow_allocate_arrow_schema(){
BEGIN_CPP11
return cpp11::as_sexp(allocate_arrow_schema());
END_CPP11
}
```
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