Yeah, that is fixed as well. The [+] metaop is special-cased to become sum() since it's pretty common and we have other optimizations for .sum, like the one on Range objects for example: 

say sum 1..999999999999999999999999999;
# 499999999999999999999999999500000000000000000000000000

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In reply to Re^3: [Perl6] [+] on a list... with a Junction by Zoffix
in thread [Perl6] [+] on a list... with a Junction by m_turner

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