Unfortunately the effect of leaving Nagle enabled is subtle. Here it
is in v25.12:
Normal:
tests/test_connection.py::test_no_delay PASSED
====================================================================== 1 passed in 13.87s
Nagle enabled:
tests/test_connection.py::test_no_delay PASSED
====================================================================== 1 passed in 21.70s
So it's hard to both catch this issue and not have false positives. Improve the
test by deliberately running with Nagle enabled, so we can do a direct comparison.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
d0c158a69d