Assert a std::io::Read read_to_string() value is less than another.
use std::io::Read; let mut a = "alfa".as_bytes(); let mut b = "bravo".as_bytes(); assert_io_read_to_string_lt!(a, b);
assert_io_read_to_string_lt
assert_io_read_to_string_lt_as_result
debug_assert_io_read_to_string_lt