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On perl 5.40.0, Scalar::Util 1.64, some tests fail:
This is because, on perl 5.40.0, Scalar::Util 1.64,
the "blessed" function actually comes from "builtin" package.
https://metacpan.org/release/PEVANS/Scalar-List-Utils-1.64/source/lib/Scalar/Util.pm#L26-37
So we should mark "builtin" as foreign.