Avoiding these sorts of pitfalls is one of the greatest benefits to using a modern language with good generics support. In C#, for example, it's actually easier to code with lists than with arrays, so you can skip the "fix it so it doesn't have an arbitrary range limit" coding step (which often never gets done anyway).
The not-so-modern language that IE is written in (C++) has a similar construct (std::vector) in its standard library. It is possible that code was originally written prior to the widespread adoption of the STL and was never updated to use it.
