Haven't worked with fuzz testing myself, but it sounds like something I'd lean towards writing. Those obscure test cases are exactly the thing you don't tend to

Haven't worked with fuzz testing myself, but it sounds like something I'd lean towards writing. Those obscure test cases are exactly the thing you don't tend to find in manual testing, and AFAIK fuzz testing is random enough that you can't be sure that every run will exercise the same bug.