Resolution Syntax

[JonasKruckenberg]

I've been working on a few additions to this repos serialization, pull request will come as soon as I get more progress done. So far I stumbled upon this part in the function regarding the resolution value.
Is there a syntax for specifying the resolution that I'm not aware of?
I tried the following
'printer-resolution-default': '400dpi'
the results after serializing and parsing for testings sake is this:
'printer-resolution-default': [ 4, 0, 'dpcm' ]

Is this intentional behavior? Since the code doesn't allow us to use arrays as a value here so this
'printer-resolution-default': [400,400,'dpi']
does not work, at the same time the code expects element value[2]==='dpi wich is clearly not possible if you are not allowing the use of arrays here.
I've been a bit hesitant to change the behavior in my local copy to use arrays since it doesn't seem to be an easy fix.
What do you think, is there something I'm missing or is this a bug?
Cheers, Jonas

[JonasKruckenberg]

I've updated my fork of IPP with what I propose as an easy fix, it's a hacky though and it uses a regex so maybe a bit on the slow side. What do you think?

The new syntax is
[cross-feed-resolution]x[feed-resolution]dpi or dpcm

So for example 400x400dpi or 300x400dpcm. This is similar to how ipptools represents it I think.
For completion the reference is RFC8011

My fix is on this branch, ignore references in this thread, it’s because I organized the code a bit for potential pull requests!