\pdfmajorversion

[Joseph Wright]

On 31/10/2019 23:58, Akira Kakuto wrote:
>> Yes, one can set it there (though if you set it above 2, the PDF 
>> doesn't show the value ...)
> 
> I think that non-existing version numbers should not be allowed.
> If I set a non-existing version number, [x]dvipdfmx by Hirata-san resets 
> it to a DEFAULT value.

For the pdfTeX patch, the concern was that such an approach leaves us  
having to alter the engine every time there is a new PDF version. At  
present 2.0 seems likely to be long-lived, but there is no guarantee on  
this. As it is, pdfTeX already allows 1.9, which I do not beleive  
exists. Tracking every PDF version seems challenging.

Joseph