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It turns out that `Double.toString()` uses some default (?) locale , while `String.format("%.1f")` uses the locale selected by the user.
So, I end up with two different decimal separators in the same message (both ‘,’ and ‘.’)

Is this expected behavior?

`toString()` returns a machine-readable string which can be parsed again using `toDouble()`

formatting is more for human-readable strings (but I guess can also be used for machine-readable output by using the right locale)

So, `toString()` uses the `en-US` locale in all cases, apparently.
(though a quick google search does not result into links to official docs)

No info in Kotlin doc, only Java doc. 

<https://docs.oracle.com/en/java/javase/12/docs/api/java.base/java/lang/Double.html#toString(double)>