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fix: avoid dangling reference in std::optional<std::reference_wrapper<T>> arguments - #6217

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ViderStar:fix-optional-refwrapper-dangling

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fix: avoid dangling reference in std::optional<std::reference_wrapper<T>> arguments#6217
ViderStar wants to merge 4 commits into
pybind:masterfrom
ViderStar:fix-optional-refwrapper-dangling

Commits on Oct 25, 2026
- fix: avoid dangling reference in std::optional<std::reference_wrapper<T>> arguments
  ViderStar
  committed
  4e39395
Commits on Oct 26, 2026
- fix: construct the optional's inner caster lazily and keep the caster movable
  ViderStar
  committed
  f116885
Commits on Oct 27, 2026
- fix: keep subcasters alive only for reference_wrapper elements, in all STL casters
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  committed
  bf831fe
Commits on Oct 28, 2026
- tests: fix -Werror and clang-tidy warnings in the reference_wrapper tests
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  committed
  70ff990