Description
I would expect the code to complile!

Troubleshooter's report

1. The issue happens at compile time
2. The error is not in the list

Environment

• Microcontroller: Teensy 4.1
• Core/Framework: Teensyduino 1.57
• IDE: 1.8.19

Reproduction code

#include <ArduinoJson.h>

void setup() {
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:

}

Remarks
I cannot get the ArduinoJson.h include to compile correctly. I get these errors:

In file included from C:\Users\gck.CAMLEY\Documents\libraries\ArduinoJson\src/ArduinoJson/Serialization/Writer.hpp:38:0,
from C:\Users\gck.CAMLEY\Documents\libraries\ArduinoJson\src/ArduinoJson/Serialization/serialize.hpp:7,
from C:\Users\gck.CAMLEY\Documents\libraries\ArduinoJson\src/ArduinoJson/Json/JsonSerializer.hpp:10,
from C:\Users\gck.CAMLEY\Documents\libraries\ArduinoJson\src/ArduinoJson/Variant/ConverterImpl.hpp:7,
from C:\Users\gck.CAMLEY\Documents\libraries\ArduinoJson\src/ArduinoJson.hpp:37,
from C:\Users\gck.CAMLEY\Documents\libraries\ArduinoJson\src/ArduinoJson.h:9,
from C:\Users\gck.CAMLEY\Documents\Arduino\sketch_oct11b\sketch_oct11b.ino:1:
C:\Users\gck.CAMLEY\Documents\libraries\ArduinoJson\src/ArduinoJson/Serialization/Writers/ArduinoStringWriter.hpp: In member function 'size_t ArduinoJson6194_1::Writer<String, void>::flush()':
C:\Users\gck.CAMLEY\Documents\libraries\ArduinoJson\src/ArduinoJson/Serialization/Writers/ArduinoStringWriter.hpp:42:29: error: could not convert '((ArduinoJson6194_1::Writer<String, void>)this)->ArduinoJson6194_1::Writer<String, void>::_destination->String::concat(((const char)((char*)(&((ArduinoJson6194_1::Writer<String, void>*)this)->ArduinoJson6194_1::Writer<String, void>::_buffer))))' from 'String' to 'bool'
if (_destination->concat(_buffer))
~~~~~~~~~~~~~~~~~~~~^~~~~~~~~
Error compiling for board Teensy++ 2.0.