See also:
writerpub fn writePositional(file: File, io: Io, buffer: []const []const u8, offset: u64) WritePositionalError!usize
pub fn writePositional(file: File, io: Io, buffer: []const []const u8, offset: u64) WritePositionalError!usize {
return io.vtable.fileWritePositional(io.userdata, file, &.{}, buffer, 1, offset);
}