This documents the current list, but ;-) I think the current list should be modified.

1. Put behavior at the top of the list, as it is the most common (a 'human factor' principle).

2. Combine performance and resource usage. Both are extremely rare and largely overlap. Time is a resource and space-hogging is bad performance. There is no difference as far as I know in terms of how we treat issues.

3. Going further: Each category should have a reason for being in terms of how we treat issues. I really think behavior, feature request, security, and other (listed in that order) are sufficient. Compiler errors, for instance, are rare (2% overall and probably less now), are covered by the build component, and are treated like bugs anyway (fixes are applied to current versions.