• New feature - DiscriminatedUnionConverter performance improvements
• New feature - Added JsonRequiredAttribute
• New feature - Added JsonSerializerSettings.ReferenceResolverProvider property
• New feature - Added DefaultContractResolver.ResolveDictionaryKey
• New feature - Added JsonDictionaryContract.DictionaryKeyResolver
• New feature - Added support for reading GUID strings as bytes in JsonTextReader
• New feature - Added EqualityComparer to JsonSerializer
• Change - Changed reading GUIDs as bytes to only support 00000000-0000-0000-0000-000000000000 format
• Change - Renamed aspnetcore50 target to dnxcore50
• Change - Marked JsonSchema as obsolete
• Change - Marked DefaultContractResolver(bool) as obsolete
• Change - Marked JsonSerializerSettings.ReferenceResolver as obsolete
• Change - Marked JsonDictionaryContract.PropertyNameResolver as obsolete
• Fix - Fixed deserializing empty strings in Hashtables
• Fix - Fixed incorrect JTokenReader.Path in certain situations
• Fix - Fixed error when serializing certain objects in medium trust
• Fix - Fixed deserializing large nullable UInt64 values
• Fix - Fixed writing large UInt64 JValues
• Fix - Fixed converting unmatched namespace prefixes in JSON to XML
• Fix - Fixed IsoDateTimeConverter on DateTime properties with DateTimeFormatHandling.DateTimeOffset
• Fix - Fixed preserving object references with read only properties
• Fix - Fixed error when deserializing large JSON integers to XML
• Fix - Fixed serializing extension data properties with no setter
• Fix - Fixed serializing discriminated unions with type name or reference tracking enabled
• Fix - Fixed DataTableConverter not using JsonSerializer settings
• Fix - Fixed resolving properties from nested interfaces
• Fix - Fixed deserializing classes derived from ConcurrentDictionary
• Fix - Fixed passing default values to constructors
• Fix - Fixed serializing root references from JsonConverters
• Fix - Fixed empty strings coerced to null not erroring with Required.Always
• Fix - Fixed invalid Required.Always error with constructor property name casing
• Fix - Fixed empty string coerce check with Required.Always and constructor