fix: background was not expanded for top level objects #47

Job	Run time
Check	2m 11s
Test Suite	7m 57s
build (macos-latest, aarch64-apple-darwin)	1m 19s
Check wasm32	1m 17s
build (macos-latest, x86_64-apple-darwin)	1m 24s
Clippy	2m 19s
Rustfmt	47s
build (ubuntu-latest, x86_64-unknown-linux-gnu)	5m 28s
trunk	2m 17s
build (windows-latest, x86_64-pc-windows-msvc, .exe)	5m 36s
	30m 35s

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