Dedupe: Location type is treated inconsistently
Per this Stack Exchange discussion, there's a UX issue that dedupe ignores location type ID for email and phone but not postal address. The consensus on that page is that we should be consistent in favor of ignoring location type everywhere.
Note that this is a change from the position taken in https://issues.civicrm.org/jira/browse/CRM-5026, but I think the 11 years that have passed since that position have given us real-world experience to favor the newly-suggested approach.
I have a patch for this, but no test yet. Once I have a test I'll submit a PR.