Hi, It's just a bug and sum is too eager about restricting the types to numeric. If you report it, I'll take a look in the next couple of days. Just email to rakudobug@perl.org

EDIT: never mind. Just fixed it in https://github.com/rakudo/rakudo/commit/8d04bec

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

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