This macro is like JSON_BUILD_STRING() but uses our json library's ability to use literal strings directly as JsonVariant objects. The changes all our codebase to use this new macro whenever we build JSON objects from literal strings. (I tried to make this automatic, i.e. to detect in JSON_BUILD_STRING() whether something is a literal string nicely and thus do this stuff automatically, but I couldn't find a way.) This should reduce memory usage of our JSON code a bit. Constant strings we use very often will now be shared and mapped directly from the ELF image.
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