For serial name Duration there already exist DurationSerializer / Serializer has not been found for type 'Duration' - kotlinx.serialization

Question

Up until now, I had been using the following libraries:
kotlin("jvm")
kotlin("plugin.serialization") version "1.7.10"
implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.3.2")
Since until now, there is no serializer for the type kotlin.time.Duration, I had my own custom serializer. So far so good.
Now I want to update the kotlinx serialization libraries to 1.4.0, which has a DurationSerializer.
When I do this, the compiler naturally protests the following:
Caused by: java.lang.IllegalArgumentException: The name of serial descriptor should uniquely identify associated serializer. For serial name Duration there already exist DurationSerializer.
So I delete my custom DurationSerializer in order to use the new one included in the library, clean and attempt to recompile. However, when I do that, the following happens:
Serializer has not been found for type 'Duration'. To use context serializer as fallback, explicitly annotate type or property with #Contextual
Basically, the new library version can tell that my custome DurationSerializer is conflicting with its own, but then can't actually use its own. How do I get around this?

Answer 1

Got the answer from the kotlinx.serialization github repository here.
Turns out the library version of the serializer will only be added in a future compiler update.
In the meantime, our serial name for the custom serializer was too similar to the libraries', causing a conflict. Changed it from kotlin.time.Duration to CustomDurationSerializer and the issue went away.