[css3-ruby] Last Call Comment #9 - ruby-span

It appears that there has been some confusion between the (X)HTML usage 
of Length and the CSS usage of <length>.  Surely the intent is not to 
sanction values like 1.5em for ruby-span?  Shouldn't it be <integer> 
instead?

Another consideration that may be too late, since this is post last 
call, is that perhaps an <integer> value for ruby-span should be 
considered legal even if it given directly instead of via an attr(x). 
(I.e make "ruby-span:1;" legal.)

I agree that the value of 0 for x in attr(x) should be equivalent to 
none, but I disagree that 0 or none should be legal values. Since the 
decision has been made to make it clear that this is essentially an 
<integer> value, and since the CSS3 Units working draft says that it is 
acceptable for individual properties to limit this to a specific range 
of values, why not simply have the spec state that it must be positive, 
with non-poistive values to be treated as invalid. The only reason I 
can see for the none value is make a default value possible.  If 
directly given <integer> values were legal, then a default value of 
value of ruby-span of 1 would be equivalent to the current draft.