v0.3.2

• perf: use close_range(..., CLOSE_RANGE_CLOEXEC) more in set_fds_cloexec() on Linux
• refactor: improve close_range() presence check on FreeBSD
• feat: read /dev/fd on iOS, just like on macOS
• Add basic example of use with a Command
• perf: on Linux, cache whether we're running on WSL 1
• perf: improve performance of slow loop fallback
• feat: add new "builders" to further customize behavior
• fix: correct getdents() link name on NetBSD
• Major internal refactors
• Improved tests and documentation