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c0eb5f89a4
The boost library unfortunately specializes `conj` for various types and assumes the original two-template-parameter version. This changes restores the second parameter. This also restores ABI compatibility. The specialization for `std::complex` is because `std::conj` is not a device function. For custom complex scalar types, users should provide their own `conj` implementation. We may consider removing the unnecessary second parameter in the future - but this will require modifying boost as well. Fixes #2112.