US285 24.05.3 p1 Prevent derived-to-base slicing with subrange constructors LWG 3282

[wg21bot]

The subrange converting constructors permit derived-to-base slicing errors. See detailed discussion of this issue in LWG#3282. 

Proposed change:
Adopt the proposed resolution at https://cplusplus.github.io/LWG/issue3282

[mclow]

LWG Belfast Friday morning. LWG3282 is currently in status "LEWG".

[tituswinters]

LEWG in Belfast: Approved.

[JeffGarland]

Review by the full group in Prague on Monday afternoon. This issue needs to be fixed in Prague. The wording is sufficient to be reviewed for C++20.

[JeffGarland]

Issue 3282 wording reviewed and updated in Prague on Monday afternoon -- will be forwarded for adoption in c++20

[jensmaurer]

Accepted with modification. See library issue 3282.