Charles Martin writes:
 > 
 > >> >           a := !a +. Array.unsafe_get xs i
 > >>     a <- a +. Array.unsafe_get xs i
 > 
 > At the risk of being off topic, I am wondering why most every code
 > scrap that appears on this list uses
 > [Array|String].unsafe_[get|set], rather than the "safe" versions.
 > Are off-by-one errors and the like so rare?  Doesn't adding
 > "-unsafe" as a compiler option to your final build have the same
 > effect?  If not, that would be worth knowing.

it's just that when one posts performance-related snippets, it saves
everyone's time if it's immediately clear that bounds checks are not
an issue
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