eartbeat.
<p>
This will prevent trying to create a heartbeat when there's not enough
room to create one and there was a payload to return as a heartbeat.
<p>
Note that this is not terribly difficult to fix.
The code we add is short.
The problem is that reading and writing buffers is extremely common,
but by default such accesses are unsafe in C and C++.
In practice it is difficult to <i>always</i> check all ranges
in all possible cases, which is why memory safety vulnerabilities
are so common in programs wr