I have reported this issue here:
https://issues.jboss.org/browse/JBRULES-3511
I have also already fixed it and pushed the fix on the master branch.
Working on the fix I also found another workaround: even replacing
feeKeys[1] with feeKeys[1+0] should work. I don't know if this is better or
worse than the former one I suggested, since it is a bit more concise but
probably also less readable.
Thanks again for reporting this,
Mario
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