Fix nullable property deserialization in OpenAPI v3 provider#287

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copilot/fix-null-date-deserialization

Commits on Jan 23, 2026

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Fix nullable date deserialization by checking JsonSchemaType.Null flag

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sergey-tihon
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Address code review feedback: clarify nullable logic and clean up test

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sergey-tihon
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Fix constructor parameter logic to match nullable-aware type generation

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sergey-tihon
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Refactor: extract nullable check into helper function for maintainability

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sergey-tihon
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Add null check to isSchemaNullable for robustness

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sergey-tihon
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