Global custom serializers

What is your use-case and why do you need this feature?

If you have a data class with many “unsupported” types, but very common types in the JDK it is unweidly to use @ContextualSerialization everywhere - either on a file basic or a property basis.

For example,

data class Foo(val decimal: BigDecimal, val id: UUID, val date: LocalDateTime)

Three types, needing three @ContextualSerialization.

Describe the solution you’d like

Some way of registering global serializers.

[angryziber]

@sandwwraith just a reminder that kolinx-serialization without this feature is unusable for a lot of developers on the JVM

[marco-eckstein]

Not global, but the file-level annotation @file:UseSerializers(MySerializer::class) mitigates the problem. See Specifying serializers for a file.