[rakudo] Rip out a chunk of duplicated code from a routine, calling the new (and correct) version instead. Also, make !keyword_has now just forward to !meta_attribute, in preparation for removing it proper.
[rakudo] Rip out a chunk of duplicated code from a routine, calling the new (and correct) version instead. Also, make !keyword_has now just forward to !meta_attribute, in preparation for removing it proper.

git-svn-id: ebc29296f9ec9cd27706eb0497c26fede0e190b2@35596 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

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