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Back to pull request #4970

MSVC: make #4526 pass (use #if for optional) - fixes #3859; re-amalgamate #4698

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MSVC: make #4526 pass (use #if for optional) - fixes #3859; re-amalgamate

MSVC: make #4526 pass (use #if for optional) - fixes #3859; re-amalgamate #4698

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ci_test_compilers_gcc (latest)

ci_test_compilers_gcc (latest)

succeeded Oct 28, 2025 in 3m 41s

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