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Thanks for the pointer, that's pretty interesting.

Looking at their doc [0] it seems they used their Adobe-Japan1 to wrap a much more wider set of characters than any single encoding standard, including ligatures, vintage encodings etc.

It seems to be a pretty big work and kinda fits with the image of PDF handling being such a monumental beast.

[0] https://github.com/adobe-type-tools/Adobe-Japan1/

Note that they are now adopted by the Unicode Ideographic Variation Database [1] among other variation databases.

[1] https://unicode.org/ivd/

Adobe gets lots of stick for its subscription and malware like Creative Cloud. But they do spend huge amount of resources on CJK fonts, layout and encoding.

And part of the reason why I like PDF.

( Behind a Paywall ) https://ken-lunde.medium.com/my-28-years-of-adobelife-e97e70...