C++/WinRT ABI interop improvements#1608

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Commits on Jul 17, 2026

Marshal boxed scalars by value via combase PropertyValue

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Box DateTime, TimeSpan, and Point in-process too

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Buffer range-for over GetAt collections (batch IVector via GetMany)
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Fix MSVC and clang-cl build breaks from the interop fast paths

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Add optional clang compiler arg to build_test_all.cmd

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Guard _hs test's literals using-directive for non-conforming NTTP compilers

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