[css-ruby] ruby annotation with identical fragments

Hi,

Is there something planned for automatic cutting fragments and to hide 
identical hiragana to avoid this ?

<ruby>
<rbc><rb>亜樹</rb><rb>ゆす子< /rb><rbc>
<rtc><rt>あぎ</rt><rt>ゆすこ</rt></rtc>
</ruby>

Or it's only :

<ruby>
<rbc><rb>亜樹</rb><rb>ゆす</rb><rb> 子</rb><rbc>
<rtc><rt>あぎ</rt><rt>ゆす</rt><rt>こ< /rt></rtc>
</ruby>

Idem with hiragana and katakana. Is it possible to hide hiragana of 
katakana ?

<ruby>
   <rbc><rb>Gユウスケ</rb></rtc>
   <rtc><rt>ジーゆうすけ</rt></rtc>
</ruby>

<ruby>
<rbc><rb>G</rb><rb>ユウスケ</rb></rtc>
<rtc><rt>ジー</rb><rb>ゆうすけ</rt></rtc>
</ruby>

Best regards.