Avoid JSON parse error on playground load (#6519) #51

Job	Run time
cargo fmt	21s
cargo fuzz	8m 43s
cargo clippy	3m 26s
cargo test \| ubuntu-latest	7m 22s
cargo test \| windows-latest	11m 13s
cargo test (wasm)	3m 10s
cargo udeps	3m 18s
Determine changes	9s
mkdocs	2m 24s
pre-commit	2m 50s
python package	2m 5s
test scripts	1m 14s
Formatter ecosystem and progress checks	4m 32s
ecosystem	0s
	50m 47s

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