ArduinoJson 6.5.0-beta
* Added implicit conversion from `JsonArray` and `JsonObject` to `JsonVariant`
* Allow mixed configuration in compilation units (issue bblanchon#809)
* Fixed object keys not being duplicated
* `JsonPair::key()` now returns a `JsonKey`
* Increased the default capacity of `DynamicJsonDocument`
* Fixed `JsonVariant::is<String>()` (closesbblanchon#763)
* Added `JsonArrayConst`, `JsonObjectConst`, and `JsonVariantConst`
* Added copy-constructor and copy-assignment-operator for `JsonDocument` (issue bblanchon#827)
ArduinoJson 5.13.3
* Improved float serialization when `-fsingle-precision-constant` is used
* Fixed `JsonVariant::is<int>()` that returned true for empty strings
* Fixed `JsonVariant::is<String>()` (closesbblanchon#763)
ArduinoJson 6.2.2-beta
* Fixed `invalid application of 'sizeof' to incomplete type '__FlashStringHelper'` (issue bblanchon#783)
* Fixed `char[]` not duplicated when passed to `JsonVariant::operator[]`
ArduinoJson 6.2.0-beta
* Disabled lazy number deserialization (issue bblanchon#772)
* Improved float serialization when `-fsingle-precision-constant` is used
* Renamed function `RawJson()` to `serialized()`
* `serializeMsgPack()` now supports values marked with `serialized()`
ArduinoJson 6.1.0-beta
* Return `JsonArray` and `JsonObject` by value instead of reference (issue bblanchon#309)
* Replaced `success()` with `isNull()`