chore: Avoid duplicate box on constructing BoxBody (#2009) #3570

Job	Run time
codegen	29s
cargo-deny check	25s
Check unused dependencies	3m 50s
clippy	1m 6s
rustfmt	14s
check (ubuntu-latest)	2m 28s
check-external-types	32s
check (macOS-latest)	2m 2s
Interop Tests (ubuntu-latest)	56s
check (windows-latest)	5m 5s
Interop Tests (macOS-latest)	43s
Interop Tests (windows-latest)	2m 50s
Check MSRV	35s
semver	56s
test (ubuntu-latest)	2m 58s
test (macOS-latest)	1m 46s
test (windows-latest)	5m 17s
	32m 12s

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