Version 3.4.0 breaks function calling with stream (chatCompletions)

[paulotaylor]

Description

Version 3.4.0 breaks function calling with stream (chatCompletions)
Version 3.3.2 works fine

Steps to Reproduce

com.aallam.openai.api.exception.OpenAIHttpException: Field 'name' is required for type with serial name 'com.aallam.openai.api.chat.FunctionCall', but it was missing at path: $.choices[0].delta.function_call
at com.aallam.openai.client.internal.http.HttpTransport.handleException(HttpTransport.kt:52)
at com.aallam.openai.client.internal.http.HttpTransport.perform(HttpTransport.kt:34)
at com.aallam.openai.client.internal.http.HttpTransport$perform$2.invokeSuspend(Unknown Source:15)
at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:108)
at kotlinx.coroutines.internal.LimitedDispatcher$Worker.run(LimitedDispatcher.kt:115)
at kotlinx.coroutines.scheduling.TaskImpl.run(Tasks.kt:103)
at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:584)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:793)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:697)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:684)
Suppressed: kotlinx.coroutines.internal.DiagnosticCoroutineContextException: [StandaloneCoroutine{Cancelling}@3dc0a39, Dispatchers.IO]
Caused by: kotlinx.serialization.MissingFieldException: Field 'name' is required for type with serial name 'com.aallam.openai.api.chat.FunctionCall', but it was missing at path: $.choices[0].delta.function_call
at kotlinx.serialization.json.internal.StreamingJsonDecoder.decodeSerializableValue(StreamingJsonDecoder.kt:93)
at kotlinx.serialization.encoding.AbstractDecoder.decodeSerializableValue(AbstractDecoder.kt:43)
at kotlinx.serialization.encoding.AbstractDecoder.decodeNullableSerializableElement(AbstractDecoder.kt:79)
at com.aallam.openai.api.chat.ChatDelta$$serializer.deserialize(ChatDelta.kt:10)
at com.aallam.openai.api.chat.ChatDelta$$serializer.deserialize(ChatDelta.kt:10)
at kotlinx.serialization.json.internal.StreamingJsonDecoder.decodeSerializableValue(StreamingJsonDecoder.kt:70)
at kotlinx.serialization.encoding.AbstractDecoder.decodeSerializableValue(AbstractDecoder.kt:43)
at kotlinx.serialization.encoding.AbstractDecoder.decodeSerializableElement(AbstractDecoder.kt:70)
at kotlinx.serialization.json.internal.StreamingJsonDecoder.decodeSerializableElement(StreamingJsonDecoder.kt:165)
at com.aallam.openai.api.chat.ChatChunk$$serializer.deserialize(ChatChunk.kt:13)
at com.aallam.openai.api.chat.ChatChunk$$serializer.deserialize(ChatChunk.kt:13)
at kotlinx.serialization.json.internal.StreamingJsonDecoder.decodeSerializableValue(StreamingJsonDecoder.kt:70)
at kotlinx.serialization.encoding.AbstractDecoder.decodeSerializableValue(AbstractDecoder.kt:43)
at kotlinx.serialization.encoding.AbstractDecoder.decodeSerializableElement(AbstractDecoder.kt:70)
at kotlinx.serialization.json.internal.StreamingJsonDecoder.decodeSerializableElement(StreamingJsonDecoder.kt:165)
at kotlinx.serialization.encoding.CompositeDecoder$DefaultImpls.decodeSerializableElement$default(Decoding.kt:533)
at kotlinx.serialization.internal.CollectionLikeSerializer.readElement(CollectionSerializers.kt:80)
at kotlinx.serialization.internal.AbstractCollectionSerializer.readElement$default(CollectionSerializers.kt:51)
at kotlinx.serialization.internal.AbstractCollectionSerializer.merge(CollectionSerializers.kt:36)
at kotlinx.serialization.internal.AbstractCollectionSerializer.deserialize(CollectionSerializers.kt:43)
at kotlinx.serialization.json.internal.StreamingJsonDecoder.decodeSerializableValue(StreamingJsonDecoder.kt:70)
at kotlinx.serialization.encoding.AbstractDecoder.decodeSerializableValue(AbstractDecoder.kt:43)
at kotlinx.serialization.encoding.AbstractDecoder.decodeSerializableElement(AbstractDecoder.kt:70)
2023-08-29 00:32:10.979 31910-32341 AndroidRuntime
at kotlinx.serialization.json.internal.StreamingJsonDecoder.decodeSerializableElement(StreamingJsonDecoder.kt:165)
at com.aallam.openai.api.chat.ChatCompletionChunk$$serializer.deserialize(ChatCompletionChunk.kt:14)
at com.aallam.openai.api.chat.ChatCompletionChunk$$serializer.deserialize(ChatCompletionChunk.kt:14)
at kotlinx.serialization.json.internal.StreamingJsonDecoder.decodeSerializableValue(StreamingJsonDecoder.kt:70)
at kotlinx.serialization.json.Json.decodeFromString(Json.kt:107)
at com.aallam.openai.client.internal.api.ChatApi$chatCompletions$1$1.invokeSuspend(ChatApi.kt:56)
at com.aallam.openai.client.internal.api.ChatApi$chatCompletions$1$1.invoke(Unknown Source:8)
at com.aallam.openai.client.internal.api.ChatApi$chatCompletions$1$1.invoke(Unknown Source:4)
at io.ktor.client.statement.HttpStatement.execute(HttpStatement.kt:50)
at io.ktor.client.statement.HttpStatement$execute$1.invokeSuspend(Unknown Source:15)
... 8 more
Caused by: kotlinx.serialization.MissingFieldException: Field 'name' is required for type with serial name 'com.aallam.openai.api.chat.FunctionCall', but it was missing
at kotlinx.serialization.internal.PluginExceptionsKt.throwMissingFieldException(PluginExceptions.kt:20)
at com.aallam.openai.api.chat.FunctionCall.(FunctionCall.kt:11)
at com.aallam.openai.api.chat.FunctionCall$$serializer.deserialize(FunctionCall.kt:11)
at com.aallam.openai.api.chat.FunctionCall$$serializer.deserialize(FunctionCall.kt:11)
at kotlinx.serialization.json.internal.StreamingJsonDecoder.decodeSerializableValue(StreamingJsonDecoder.kt:70)
... 40 more

Environment

• openai-kotlin version: 3.4.0
• Kotlin version: 1.9.10
• OS: Android 13