On Mon, Jun 24 2024, Gerd Möllmann wrote:

>> Here is an attempt to use an enum.  I'm not sure that it's easier to
>> read and the enum constants have odd names.
>
> Pushed!

I have one more patch: it moves the bufoffset field back to the union.
I think that's a bit nicer; and with the predicate enum there is enough
room to do it.

There other patch, sets some fields in a popped handler to nil to avoid
a potential leak.

> We even spared a word in the struct :-).

Right, I haven't even noticed that.  Now the union only needs one word
and the type fields could be packed in 3 bits.  That would probably be
small enough to store it in a symbol.