Correct default value of IV entry in Table 322 from false to true.

[crlf0710]

In table 322 the default value of IV entry is false. However in existing commercial products like acrobat, the value of this entry has always been interpreted as true if missing. (And it is indeed that true as default value is more natural)

I'm not sure whether it's better to just change the specification in this case, or just claim that every existing implementation has been wrong. Personally i feel the former approach is more practical and helpful.

[lrosenthol]

I can confirm that the Adobe implementation sets the default value to true prior to reading this dictionary, thus leading to that becoming the "default".

[petervwyatt]

Proposed solution as above

[petervwyatt]

PDF TWG agreed