romainfrancois commented on pull request #7819:
URL: https://github.com/apache/arrow/pull/7819#issuecomment-677596450
Rcpp has these :
```cpp
/* long are represented as numeric vectors which allows more precision
to be preserved than int */
template<> struct r_sexptype_traits<long>{ enum{ rtype = REALSXP } ; } ;
template<> struct r_sexptype_traits<unsigned long>{ enum{ rtype = REALSXP }
; } ;
```
so `uintptr_t` aka `unsigned long` (at least locally for me) get converted
to a `double`
I believe both are wrong (in terms of what this tries to do), but `cpp11` is
wronger.
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