It's important to note that this set of rules is for use with a small (<10000), known, possibly hand crafted set of results.

> Exact matches always come first.

One place this very first rule doesn't work is autocomplete for geocoding.

If you are typing "London":

- There is a village called Lon, Pakistan [1]

- There is also a village called Lond, Pakistan [2]

- There are numerous places called Londo all over the world [3]

So its necessary to determine that some places are more likely to be typed than others (population is a commonly available number that can help, but doesn't always work), or autocomplete becomes useless.

[1]https://spelunker.whosonfirst.org/id/1209616309/

[2]http://www.geonames.org/1370290/lond.html

[3]http://www.geonames.org/advanced-search.html?q=londo&country...