Guillaume Gomez 9f32ab88af
Rollup merge of #89664 - timClicks:51430-document-boxed-conversions, r=m-ou-se
Add documentation to boxed conversions

Among other changes, documents whether allocations are necessary
to complete the type conversion.

Part of #51430, supersedes #89199
2021-10-09 17:08:41 +02:00
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