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Document requirement to flush() Sink when using Json.encodeToSink

docs needed

Status: Open.

#3271 In Kotlin/kotlinx.serialization;

· solonovamax opened on Sep 13, 2026

SerializationException: Report fully qualified class name when class is not registered

Status: Open.

#3268 In Kotlin/kotlinx.serialization;

· fzhinkin opened on Sep 9, 2026

JsonPrimitive.longOrNull returns a wrapped value for integers above 2^64

bug

Status: Open.

Bug

#3267 In Kotlin/kotlinx.serialization;

· jarohen opened on Sep 9, 2026

Also re-throw SerializationException as JsonDecodingException

feature

Status: Open.

#3262 In Kotlin/kotlinx.serialization;

· NichtStudioCode opened on Sep 8, 2026

[benchmark] Request for call-path / fairness review (GLD.SerializerBenchmark)

performance

Status: Open.

#3260 In Kotlin/kotlinx.serialization;

· leo-gan opened on Sep 4, 2026

Long numbers are truncated when serializing JsonElement

bug

json

reproduced

Status: Open.

Bug

#3257 In Kotlin/kotlinx.serialization;

· SPC-code opened on Sep 4, 2026

Get rid of NamedValueEncoder/Decoder in TreeJson*

json

performance

Status: Open.

#3249 In Kotlin/kotlinx.serialization;

· qwwdfsad opened on Sep 2, 2026

Supported hook for substituting serializers during a (de)serialization operation

Status: Open.

#3243 In Kotlin/kotlinx.serialization;

· kamalnayan04 opened on Aug 31, 2026

Generic sealed type used as a Map value: the map-KEY serializer is wired into the map-VALUE's type-argument slot, causing a ClassCastException.

bug

reproduced

Status: Open.

#3222 In Kotlin/kotlinx.serialization;

· uliSchuster opened on Jul 14, 2026

Properties marked with @EncodeDefault in data objects are ignored

docs needed

Status: Open.

#3214 In Kotlin/kotlinx.serialization;

· RaySmith-ttc opened on Jul 4, 2026

CBOR @ValueTags is not encoded with primitive types

cbor

Status: Open.

#3198 In Kotlin/kotlinx.serialization;

· jksiezni opened on May 17, 2026

More granular control of class discriminator at use site

feature

Status: Open.

#3187 In Kotlin/kotlinx.serialization;

· geoffliu opened on Apr 24, 2026