[pcre-dev] Some words about assertion docs

[ND via Pcre-dev]

Good day!


In ASSERTIONS chapter I can't find words that assertions are atomic. This  
information can be seen much far for this chapter in backtracking control  
verbs part.
It can be important IMHO to put this info in ASSERTIONS chapter.


But why assertions are atomic? I guess answer is: "Because it does in  
Perl". But why?


Thanks.

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