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Not sure if I should report this here or to JRuby but the error seems to come from joni:
$ bin/jruby -e 'p [0xA4].pack("C").force_encoding("UTF-8").grapheme_clusters'
Unhandled Java exception: java.lang.ArrayIndexOutOfBoundsException: -1
java.lang.ArrayIndexOutOfBoundsException: -1
length at org/jcodings/specific/UTF8Encoding.java:30
isMbcHead at org/jcodings/Encoding.java:497
opCClassMB at org/joni/ByteCodeMachine.java:793
execute at org/joni/ByteCodeMachine.java:203
matchAt at org/joni/ByteCodeMachine.java:167
matchCommon at org/joni/Matcher.java:115
match at org/joni/Matcher.java:92
enumerateGraphemeClusters at org/jruby/RubyString.java:5859
grapheme_clusters at org/jruby/RubyString.java:5872
call at org/jruby/RubyString$INVOKER$i$0$0$grapheme_clusters.gen:-1
call at org/jruby/internal/runtime/methods/JavaMethod.java:309
cacheAndCall at org/jruby/runtime/callsite/CachingCallSite.java:323
call at org/jruby/runtime/callsite/CachingCallSite.java:139
invokeOther5:grapheme_clusters at -e:1
<main> at -e:1
invokeWithArguments at java/lang/invoke/MethodHandle.java:627
load at org/jruby/ir/Compiler.java:94
runScript at org/jruby/Ruby.java:852
runNormally at org/jruby/Ruby.java:771
runNormally at org/jruby/Ruby.java:789
runFromMain at org/jruby/Ruby.java:601
doRunFromMain at org/jruby/Main.java:415
internalRun at org/jruby/Main.java:307
run at org/jruby/Main.java:234
main at org/jruby/Main.java:206
The new spec spec/ruby/core/string/shared/grapheme_clusters.rb added in jruby/jruby#5385 fails due to this.
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