What should or should not be encoded in Unicode? (from Re: Egyptian Hieroglyph Man with a Laptop)

[Hans Åberg via Unicode]

> On 13 Feb 2020, at 16:41, wjgo_10009 at btinternet.com via Unicode <unicode at unicode.org> wrote:
> 
> Yet a Private Use Area encoding at a particular code point is not unique. Thus, except with care amongst people who are aware of the particular encoding, there is no interoperability, such as with regular Unicode encoded characters.
> 
> However faced with a need for interoperability for my research project, I have found a solution making use of the Glyph Substitution capability of an OpenType font.
> 
> The solution is to invent my own encoding space. This sits on top of Unicode, could be (perhaps?) called markup, but it works!

It may be perilous, because some software may enforce the strict official code point limits.

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