How do we find out what assigned code points aren't normally used in text?

On 07/06/2011 04:23 PM, Ken Whistler wrote:
> I'm not sure whether the FB05/FB06 instance is important enough to add
> or not. Neither of those compabitility ligatures should ordinarily be used
> in text, anyway ...
>
> --Ken

I'm wondering what other characters might not ordinarily be used in
text, or how to discover which ones aren't. We're discovering that
getting these ligatures to work is quite hard, and it would be nice to
know where it's really appropriate to expend the implementation effort.
Received on Fri Sep 09 2011 - 14:32:27 CDT