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90         function loadDefaultTables() {
 91                 $this->mTables = array(
 92                         'lowercase' => new ReplacementArray( $this->mUpperToLowerCaseLatin ),
 93                         'ike-cans' => new ReplacementArray( $this->mToSyllabics ),
 94                         'ike-latn' => new ReplacementArray( $this->mToLatin ),
 95                         'iu' => new ReplacementArray()
 96                 );
 97         }

In other parts of the codebase, there're some assumptions that variant codes are language codes ('lowercase' variant?), and variants for a main language code "foo" match "foo-*" ('iu' vs 'ike-*'?). I'm not sure whether this will cause any breakage somewhere and by looking at the whole LanguageIu.php file it seems there're many non-standard settings. Someone who knows the language should check if everything works fine...