Add an .onAttach message requesting use cases as asked by R Core (#363)

Author: MichaelChirico

NEWS.md

@@ -26,6 +26,8 @@
 
 1. The R version dependency has been bumped from 3.5.0 (2018) to 3.6.0 (2019).
 
+1. R Core is considering adding native support for 64-bit integer vectors. `library(bit64)` will temporarily flash a request for use cases of 64-bit integers as posed by Luke Tierney: https://stat.ethz.ch/pipermail/r-devel/2026-July/084631.html. 
+
 # bit64 4.8.2 (2026-05-19)
 
 ## BUG FIXES

R/zzz.R

@@ -13,6 +13,15 @@
 }
 # nocov end
 
+.onAttach = function(libname, pkgname) {
+  packageStartupMessage(
+    strrep("*", .7*getOption("width")), "\n",
+    "R-core is collecting use cases for 64-bit integers as they explore native support for these vectors.\n\n",
+    "See https://stat.ethz.ch/pipermail/r-devel/2026-July/084631.html and reach out to Luke Tierney (luke-tierney@uiowa.edu).\n",
+    strrep("*", .7*getOption("width")), "\n"
+  )
+}
+
 if (getRversion() < "4.4.0") {
   # nolint next: coalesce_linter.
   `%||%` = function(x, y) if (is.null(x)) y else x