[issue8530] Stringlib fastsearch can read beyond the front of an array

[Alex]

Alex <alex.gaynor at gmail.com> added the comment:

Well, the fact that it hasn't been shown to fail doesn't mean it can't fail.  It relies on reading undefined memory, which is usually bad ;).  However, since we're at i=0, regardless of what we add to the value it's going to end up terminating the loop, so I'm not sure if it can actually break in practice.

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