Multi-line string literals in Fish

The Fish shell has… interesting syntax for multi-line string literals. The only way I can reliably remember is to literally write them as multi-line literals, which does make a certain kind of brutalist sense:

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function kiitos
  set thankyou '---
kiitos kaynnista
ja tervetuloa uduelleen
---'
  echo $thankyou
end

kiitos

reliably prints

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---
kiitos kaynnista
ja tervetuloa uduelleen
---

, but man does it look funky to me.