process_fd_count返回值上限为10004

请问一下，如果目前进程的资源描述符个数超过10004个，bvar里面的process_fd_count最后只能返回10004，请问这个是处于什么考虑？

Locate the bvar implementation of process_fd_count and inspect how the process file-descriptor count is obtained and capped at 10004. Confirm whether the limit is intentional, identify its rationale from the surrounding code or history, and report the maintainer-approved behavior or required change.

Written by the indexing model from the issue text.