On Sat, 9 Feb 2019 20:04:20 -0600, Joel C. Ewing wrote:

>Normally "Toleration PTF" is a term used for a PTF for version A of a
>product to keep it from going bonkers when it sees some construct
>introduced by new feature in a  later version B of the same product. 

That is one form of toleration PTF. Another is a PTF to a third party 
product so that it will work with a new release of the operating system 
or of some other product, for example, a compiler. Yet another is so 
that the product will be able to run in the presence of new hardware.

-- 
Tom Marchant

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