fix 784: dont crash on huge in-memory bodies #17

Job	Run time
Soundness / API breakage check	3m 22s
Soundness / Broken symlinks check	3s
Soundness / Documentation check	2m 29s
Soundness / License headers check	5s
Soundness / Unacceptable language check	3s
Soundness / Format check	42s
Soundness / Python lint check	4s
Soundness / Shell check	34s
Soundness / YAML lint check	3s
Cxx interop / Cxx interop / Linux (5.9)	2m 2s
Cxx interop / Cxx interop / Linux (5.10)	2m 6s
Cxx interop / Cxx interop / Windows (6.0)	1s
Cxx interop / Cxx interop / Linux (6.0)	2m 25s
Cxx interop / Cxx interop / Windows (nightly-6.0)	3s
Cxx interop / Cxx interop / Linux (nightly-6.0)	2m 45s
Cxx interop / Cxx interop / Windows (nightly-main)	1s
Cxx interop / Cxx interop / Linux (nightly-main)	2m 48s
Unit tests / Unit tests / Windows (6.0)	3s
Unit tests / Unit tests / Linux (5.9)	2m 2s
Unit tests / Unit tests / Windows (nightly-6.0)	2s
Unit tests / Unit tests / Linux (5.10)	1m 55s
Unit tests / Unit tests / Windows (nightly-main)	1s
Unit tests / Unit tests / Linux (6.0)	4m 39s
Unit tests / Unit tests / Linux (nightly-6.0)	5m 9s
Unit tests / Unit tests / Linux (nightly-main)	5m 15s
	38m 42s

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