Tracking issue for Adjust default object bounds (RFC 1156)

[aturon]

rust-lang/rfcs#1156

[nikomatsakis]

#26370 has landed on nightly, it implements the warnings. PR #26829 rebases the same work to beta. Once that has landed, we can modify nightly to use the newer defaults (and not issue warnings anymore).

[nikomatsakis]

I...believe this has been done and is all settled now.

[nikomatsakis]

In particular: #27045