[perl #120656] [jvm] InvalidArgumentException when creating a large hash with =>

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21:51 <dagurval> r: my @a = ^512; my %b = @a; my %c = eval %b.perl;
21:51 <camelia> rakudo-jvm 874e35:
OUTPUT«java.lang.IllegalArgumentException: bad
                parameter count 259␤  in block  at eval_0:1␤  in sub eval at
                gen/jvm/CORE.setting:684␤  in block  at /tmp/0ovfYy8OzU:1␤
in any
                eval at gen/jvm/stage2/NQPHLL.nqp:1086␤  in any evalfiles at
                gen/jvm/stage2/NQP…»
21:51 <camelia> ..rakudo-parrot 874e35: ( no output )

Note that the output of %b.perl uses =>

Creating a large hash using , works.