fix: don't require constructor on source type in mapper#17
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The compiler plugin crashed with 'No primary constructor found' when the source type had no accessible constructor (e.g. private constructor, interface). The source type only needs readable properties, not a constructor — only the target type needs one for construction. Closes #16 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
Shape.constructornullable so source types without constructors (interfaces, abstract classes, private constructors from other modules) don't crash the compiler pluginCloses #16
Test plan
🤖 Generated with Claude Code