`is<T>()` returns wrong value, only with bool

Created by: marvinroger

I am using an ESP8266 (NodeMCU 1.0) with the following sketch:

#include <ArduinoJson.h>

const char* json = "{\"ota\": {\"enabled\": true}}";

void setup() {
  Serial.begin(115200);
  Serial.println();

  StaticJsonBuffer<JSON_OBJECT_SIZE(1) + JSON_OBJECT_SIZE(1)> jsonBuffer;
  JsonObject& parsedJson = jsonBuffer.parseObject(json);
  if (parsedJson["ota"]["enabled"].is<bool>()) {
    Serial.println("ota.enabled is a bool");
  } else {
    Serial.println("ota.enabled is not a bool");
  }
}

void loop() {
  delay(1000);
}

This prints ota.enabled is not a bool, but it obviously is. Note I tested with const char*, unsigned long, JsonObject& and it works well, the problem only appears with bool.