Key

Represents a discriminator strategy where the subtype identifier is encoded as the key of a JSON object.

It is a default strategy for serializing and deserializing of all kinds of variants (sealed hierarchies, union types, etc.).

In this strategy, the serialized representation of the subtype wraps the encoded value in a JSON object keyed by the subtype's discriminator, e.g., {"SubtypeIdentifier": {...}}.

This approach enables subtype differentiation based solely on the key of the JSON object for the sealed hierarchy.