Note that IO functions use UTF-8 paths

Author: Sainan

docs/Runtime Environment/IO.md

@@ -1,5 +1,7 @@
 This page documents the changes & additions to the `io` library in Pluto, which is built on top of Lua 5.4's.
 
+To improve cross-platform consistency, all IO functions assume UTF-8 encoding for paths.
+
 ---
 ### `io.rename`
 A variant of Lua's `os.rename` that raises an error on failure and instead has no return values.

docs/Runtime Environment/OS.md

@@ -21,3 +21,9 @@ os.sleep(1000) -- Pause this thread for 1000ms.
 All of these return their respective times since implementation-specific epoch.
 ### `os.unixseconds`
 Returns seconds since UNIX epoch.
+
+
+---
+### `os.rename`, `os.remove`
+Although we'd rather these functions be in the IO library, these Lua variants are retained, but modified to assume UTF-8 path encoding for the same cross-platform consistency the IO library has.
+