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`FoRScheme`: declare and refine its bit-packed child #14216

Job	Run time
Rust tests (miri)	3m 52s
Rust tests (tsan)	9m 24s
Rust/C++ FFI tests (tsan)	1m 42s
Rust/C++ FFI tests (asan)	1m 24s
Rust tests (asan)	7m 16s
C++ API (coverage)	0s
Rust tests (coverage) (${{ matrix.suite }})	0s
	23m 38s