[rakudo] prefix:+ and prefix:- should preserve integer type when done on an integer.
[rakudo] prefix:+ and prefix:- should preserve integer type when done on an integer.

git-svn-id: ebc29296f9ec9cd27706eb0497c26fede0e190b2@28085 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

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