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They are hard to use anyway and these days fast debugger are stable. Not sure how, yet.
Classic debuggers (for native Ruby and JRuby) are kind of deprecated now. The explicit debugger-type choice in the Ruby Platform Manager has gone. Classic debugger is still used when gems needed for fast debugging are not available. Otherwise fast debugger is always used automatically. http://hg.netbeans.org/main/rev/5e06edf490af