lib/std/Io.zig                  | 247 ++++++++------
 lib/std/Io/File.zig             |   7 +-
 lib/std/Io/File/MultiReader.zig |  52 ++-
 lib/std/Io/Threaded.zig         | 569 +++++++++++++++++++-------------
 4 files changed, 508 insertions(+), 367 deletions(-)