Tim McNamara 6a52fb7303 Add documentation to boxed conversions
Among other changes, documents whether allocations are necessary
to complete the type conversion.

Part of #51430

Co-authored-by: Giacomo Stevanato <giaco.stevanato@gmail.com>

Co-authored-by: Joshua Nelson <github@jyn.dev>
2021-10-08 21:40:25 +13:00
..