[i18n-activity] Should we allow more overhang for Chinese?

r12a has just created a new issue for 
https://github.com/w3c/i18n-activity:

== Should we allow more overhang for Chinese? ==
10.2.38 tts:rubyOverhangClass
https://www.w3.org/TR/2016/WD-ttml2-20161117/#style-attribute-rubyOverhangClass

> If the language of the base text is specified or can be inferred as 
Chinese or Korean, then auto should be interpreted as if the following
 were specified: ideographic.

I've [raised the question](https://github.com/w3c/clreq/issues/129) 
for Chinese with the cLReq folks, but from looking at the document, 
the rules seem less restrictive than Japanese.  TTML2 currently only 
allows overlap of `ideographic` and not of punctuation.

Please view or discuss this issue at 
https://github.com/w3c/i18n-activity/issues/342 using your GitHub 
account