[kotlin-spring] fix multi-level allOf inheritance (fixes #18206)#23954

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rvlasveld:fix/kotlin-spring-multilevel-allof-inheritance

Commits on Jun 5, 2026

[kotlin-spring] allOf discriminator children get default discriminator value

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[kotlin-spring] seal allOf discriminator parent interfaces by default

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[kotlin-spring] fix multi-level allOf inheritance (fixes #18206)

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review: fix empty-parent-ctor edge case, drop @Getter, strengthen test

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review: remove PR-references from test comments

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review: merge discriminator loops, inline addSwitch description

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feat(kotlin-spring): generate equals/hashCode/toString for open class mid-level models

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feat(kotlin-spring): generate copy() for open class mid-level models

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