I don't
expect any software to be bug-free.
TeX? ;-)
TeX is distinctive in that it is one of the very few pieces of
software anything like its size that I've used to any substantial
extent but have never run into a bug in.
I suppose I expect TeX to be bug-free in a pragmatic "if you don't run
into it then it doesn't exist" sense, for "consider probable or
likely"
values of "expect".
But when I wrote that, I really meant more the "consider reasonable or
justified" value of "expect", and I also was speaking in a more
abstract sense than a pragmatic sense, that is, a sense in which a bug
that nobody ever trips over is considered to exist.
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