Currently only some characters are normalized to a "canonical" form. For example, although ccnorm("α") results in "A", ccnorm("ά") doesn't change anything.
The function should support the conversion of more characters.
The following list is based on what was available at en:MediaWiki:Titleblacklist, but maybe it is better to have different sets of characters depending on the case of the letter. For example, ⅅ for D, but ⅆ for d.
a: aαąăãàāάạậảấầẩắằẵẳẫặḁǟǡȁᾳὰᾀἁᾁἄᾄἂᾂἆᾆἅᾅἃᾃἇᾇáâäæåǻ٩4 b: bßβбв฿ c: cċĉ¢сćĉçč d: dďḍðⅆ e: éèëeęěĕėẻẹếềễểȨȩḝēḗȅȇệḙḛ3عڠẽə f: fғ₣ g: gĝģğġɠǥǧǵḡԌ h: hήĥħȞʰʱḣḥḧḩḫнңӈӉηἠἡἢἣἤἥἦἧὴᾐћⱧԋњһ i: iìíîïĩļǐīĭḷŀιїɨ!łľį k: kķкќқҝҡҟӄ l: l₤ĺľḷłŀλлљ m: mɯḿṁṃмӍμ₥ n: n₦ńñņňṇν o: oóòôöõǒōŏǫőœøəόοωὸὀὁὄὂὅὃоөӧӫδσʘǿọ p: pƥṕṗǷ₧þρр q: qɊʠ r: rŕŗřȑȓƦʳʴʵʶṙṛṝṟя® s: s$śŝşšṣσѕ t: tţťṭτтŧ u: uúùûüũůǔūǖǘǚǜŭųű w: wŵẁẃẅẇẉ₩ x: xҳχ y: yýÿŷƴȲʸẏỳỵỷỹʊύυϋὑὓὕὗὺῠῡуϓ z: zźžż