Checkf() and "Formatting string must be a TCHAR array"

Development Programming & Scripting C++
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1

4.19 Introduced an error in this code, which previously compiled:

FString a = TEXT("any text");
checkf(false, *a);

What options do I need to use to make this work?

2

checkf(false, TEXT("%s"), *a);

3

Seriously is there a single person at Epic who understands the whole engine anymore? Or do you need a hive mind to look through this moloch?