The BufferPool::writeHex() method takes a string-pointer, we add an int
max-number-of-chars to be parsed on that string.
This allows us to not just stop at the first non-hex char, but also
after a set number of characters.
This effectively allows us to use non-zere-terminated strings as
argument too.
Using the forget() method too many times could lead to an invalid
(negative size) ConstBuffer being created.
This fixes and immediately copies an assert used in many other places in
the code already.
The old algorithm could end up doubling the size every time it
ran out, which eventually consumes all memory.
This way we reset to the user-default size when useful and increase
only based on need.
This means that the programmer needs to make a better estimation on
maximum size of messages, but it avoids behavior similar to memory
leaks.
tomFlowee
TomZ