This code below doesn't work on Linux, but act correctly on macOS.

auto v = document{} << "_id" << -1 << finalize;
option.sort(v.view());

and on linux, no error message showed if i write string "-1" instead of -1, and got 'Bad specification error' on macOS.

auto v = document{} << "_id" << "-1" << finalize;
option.sort(v.view());