[MPEG-OTSPEC] [EXTERNAL] Proposal to deprecate derived search values

[Simon Cozens]

On 30/08/2020 23:27, Renzhi Li wrote:
> A good recommendation should be that, a font /reader/ should ignore 
> these fields, and a font /writer/ should always provide proper values in 
> case this font is put into legacy systems.

I think this is what I am suggesting:

> I propose that these fields be deprecated for font consumers in the next
> OFF version, with a path to becoming marked "unused" for both font
> consumers and font producers in a specified future version.

(CommonType uses "font consumers" and "font producers" for this 
distinction, which I think is an important distinction we need to make 
when deprecating or discouraging portions of the spec.)