>>I am not a fan of collections and I don't use them. Arrays and custom (and mostly "Empty") object does good for me in most cases.
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>I use collections a lot, but for small things, order of magnitude of a couple hundred elements max. They do help in cases where the search key is a string, and aScan() would match a shorter search string in a longer one, i.e. if a[4]="abc" and a[92]="ab", ascan(a, "ab") returns 4, not 92. Not so with collections, or at least I don't have to pad the key strings.
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That depends on Set('Exact')

In addition, there are flags you can pass to ascan()