Package iox provides non-blocking I/O helpers that extend Go's standard io semantics with explicit non-failure control-flow errors (see ErrWouldBlock, ErrMore) while remaining compatible with standard library interfaces. IDE note: iox re-exports (aliases) the core io interfaces so that users can stay in the "iox" namespace while reading documentation and navigating types. The contracts below mirror the standard io expectations, with iox-specific behavior documented where relevant (typically at call sites such as Copy).