A note on for each and for in in ActionScript 3

He was unpleasantly surprised by such unfortunate fact that these constructions work in a very peculiar and unpredictable way.

There is an array starting not with 0, but for example 2:
2 => object ;
3 => string;
4 => object;


So brute force with the help of for each and for in constructions of such an array will begin, correctly with 4 :). Rather, it’s not a fact that next time with 4 it can of course start with 3 (although there is a vague suspicion that there is a pattern!). In general, as he wants.
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As knowledgeable people explained, it all depends on the sequence of filling the array. Although my array was filled very consistently.
As a result, he returned to the good old for

Osadochek remained however.

ZY in the regexp construction / \ b, the cyrillic \ b / will not work. With the Latin alphabet, \ b works.

ZYY if you take an array with the initial key 0, then the search is always ordered.

UPD

Dear pixelcube user explained in the comments what the trick is.