Found the following significant warnings:
  vroom_big_int.h:59:30: warning: format '%d' expects argument of type 'int', but argument 2 has type 'R_xlen_t' {aka 'long long int'} [-Wformat=]
  vroom_chr.h:41:26: warning: format '%d' expects argument of type 'int', but argument 2 has type 'R_xlen_t' {aka 'long long int'} [-Wformat=]
  vroom_dttm.h:68:27: warning: format '%d' expects argument of type 'int', but argument 2 has type 'R_xlen_t' {aka 'long long int'} [-Wformat=]
  vroom_date.h:50:27: warning: format '%d' expects argument of type 'int', but argument 2 has type 'R_xlen_t' {aka 'long long int'} [-Wformat=]
  vroom_dbl.h:40:26: warning: format '%d' expects argument of type 'int', but argument 2 has type 'R_xlen_t' {aka 'long long int'} [-Wformat=]
  vroom_fct.h:125:29: warning: format '%d' expects argument of type 'int', but argument 2 has type 'R_xlen_t' {aka 'long long int'} [-Wformat=]
  vroom_int.h:38:26: warning: format '%d' expects argument of type 'int', but argument 2 has type 'R_xlen_t' {aka 'long long int'} [-Wformat=]
  vroom_num.h:50:26: warning: format '%d' expects argument of type 'int', but argument 2 has type 'R_xlen_t' {aka 'long long int'} [-Wformat=]
  vroom_time.h:50:27: warning: format '%d' expects argument of type 'int', but argument 2 has type 'R_xlen_t' {aka 'long long int'} [-Wformat=]
  unicode_fopen.h:52:52: warning: conversion lacks type at end of format [-Wformat=]
  unicode_fopen.h:52:14: warning: too many arguments for format [-Wformat-extra-args]
  unicode_fopen.h:78:52: warning: conversion lacks type at end of format [-Wformat=]
  unicode_fopen.h:78:14: warning: too many arguments for format [-Wformat-extra-args]
  vroom_rle.h:43:26: warning: format '%d' expects argument of type 'int', but argument 2 has type 'R_xlen_t' {aka 'long long int'} [-Wformat=]
  vroom_write.cc:272:16: warning: field precision specifier '.*' expects argument of type 'int', but argument 2 has type 'std::vector<char>::size_type' {aka 'long long unsigned int'} [-Wformat=]
See 'd:/Rcompile/CRANpkg/local/4.4/vroom.Rcheck/00install.out' for details.
* used C compiler: 'gcc.exe (GCC) 12.3.0'
* used C++ compiler: 'g++.exe (GCC) 12.3.0'