ArduinoJson 6.17.0 * Added a build failure when nullptr is defined as a macro (issue #1355) * Added `JsonDocument::overflowed()` which tells if the memory pool was too small (issue #1358) * Added `DeserializationError::EmptyInput` which tells if the input was empty * Added `DeserializationError::f_str()` which returns a `const __FlashStringHelper*` (issue #846) * Added `operator|(JsonVariantConst, JsonVariantConst)` * Added filtering for MessagePack (issue #1298, PR #1394 by Luca Passarella) * Moved float convertion tables to PROGMEM * Fixed `JsonVariant::set((char*)0)` which returned false instead of true (issue #1368) * Fixed error `No such file or directory #include <WString.h>` (issue #1381)