Incremental/Continuous crawl and case sensitivity - Duplicate items

I just stumbled upon an interesting behavior:

1. Have a list item:
   
   
   
   • Title: My Special List Item
   
   
   
   


2. Perform a crawl (continuous / incremental crawl)
   
   
   
   • Search returns 1 result.
   
   
   
   


3. Rename the list item with different casing: "my special list item"


4. Perform a continuous / incremental crawl
   
   
   
   • Search returns 2 results. One for each case (my special... & My Special...)
   
   
   • The DocId managed property is different for both search results
   
   
   • The Duplicate Rows are 0 or in other words: Total Rows: 2, Total Rows including Duplicates: 2, so trimduplicates=true does not help, still 2 results.
   
   
   
   


5. When I now perform a full crawl, the duplicate entry is removed.

It seems as continuous and incremental crawl do not take care of casing and create a duplicate entry for when only the casing of an item is changed. Besides running a full crawl, is there anything else I could do about this?