Fix standard library

Author: Victorious3

std/io.pr

@@ -156,7 +156,7 @@ export const NO_BLOCKING = 1
         return linux::isatty(cstd::fileno(file)) != 0
     }
 
-    export def open_memory_as_file(arr: [uint8], mode: String) -> File {
-        return cstd::fmemopen(arr.value, arr.size, mode.to_array().value)
+    export def open_memory_as_file(arr: [uint8], mode: string) -> File {
+        return cstd::fmemopen(arr.value, arr.size, mode.value)
     }
 }