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kotlinlang

Hello, I am the maintainer of jackson-module-kotlin.
I have made some performance improvements to value class related processes for `2.20.x`.

In particular, I have confirmed that the throughput can be more than doubled in the general case, especially for the serialization process.
Also, I have seen performance improvements of several percent in both serialization and deserialization.
(The larger the number of properties of a value class in the processing target, the larger the absolute improvement.)

For more details, please refer to the following
<https://github.com/FasterXML/jackson-module-kotlin/pull/1018>

Since this change is extensive, including the introduction of MethodHandle, I would appreciate your help in testing it.
At this time, it is available from the 2.20.0 snapshot.

&gt;&gt; The larger the number of properties of a value class in the processing target, the larger the absolute improvement.
Not following this - a value class has a single property.

I meant to mention the following `Target`
```@JvmInline
value class V(val v: Int)

data class Target(val v0: V, val v1: V, val v2: V, ...)```