can confirm it's a Dir[] thing when '{}' is passed ... work-around on its way

jruby-1.7.19 :004 > Dir['{}']
Java::JavaLang::ArrayIndexOutOfBoundsException: 0
    from org.jruby.util.Dir.isAbsolutePath(Dir.java:550)
    from org.jruby.util.Dir.glob_helper(Dir.java:649)
    from org.jruby.util.Dir.push_globs(Dir.java:466)
    from org.jruby.util.Dir.push_braces(Dir.java:439)
    from org.jruby.util.Dir.push_braces(Dir.java:457)
    from org.jruby.util.Dir.push_glob(Dir.java:303)
    from org.jruby.RubyDir.aref(RubyDir.java:206)
    from org.jruby.RubyDir$INVOKER$s$0$0$aref.call(RubyDir$INVOKER$s$0$0$aref.gen)
    from org.jruby.internal.runtime.methods.JavaMethod$JavaMethodN.call(JavaMethod.java:665)
    from org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:206)
    from org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:326)
    from org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:170)
    from org.jruby.ast.CallOneArgNode.interpret(CallOneArgNode.java:57)
    from org.jruby.ast.NewlineNode.interpret(NewlineNode.java:105)
    from org.jruby.ast.RootNode.interpret(RootNode.java:129)
    from org.jruby.evaluator.ASTInterpreter.INTERPRET_EVAL(ASTInterpreter.java:95)
... 121 levels...

Uh oh!

Dir['{}'] crashes with java.lang.ArrayIndexOutOfBoundsException: 0 #2922

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