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is it possible to concatenate elvis operators? for example, this doesn't give compile error:
```fontSize = spTextSize ?: oldTextSize ?: 0.sp,```
is anything wrong with it? my intention is that if spTextSize is null, set oldTextSize, but if oldTextSize  is null too, then set 0.sp

Works on the playground. Get sure that all types are the same.
<https://pl.kotl.in/wXTjQmI3T|https://pl.kotl.in/wXTjQmI3T>

yes, it works, the issue here is that I can't find anything about this in the official kotlin documentation

and I'm afraid as this is not documented, maybe I'll stop working or change behaviour at any moment

It's fine, it's how all operators work, they applied from left to right

If you want, you may rely on Kotlin language specification
<https://kotlinlang.org/spec/syntax-and-grammar.html#grammar-rule-elvisExpression>

This will work, no issue with this. Very common in use cases like yours.