Fix #886: use `default` instead of `null` for optional struct ByRef parameters#1253

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GrahamTheCoder merged 6 commits intoicsharpcode:masterfrom

GrahamTheCoder:claude/fix-issue-886-optional-struct-ref

Apr 18, 2026

Commits on Apr 17, 2026

Recharacterize tests to match current converter output
claude
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