Before this patch, cp -R src/ dst is equivalent to cp -R src/. dst. This patch make it so cp -R src/ dst is now equivalent to cp -R src dst.
Historically OpenBSD has opted this patch behaviour a long time ago, we elected to document the trailing slash, and NetBSD has changed to this patch behaviour as well.
Because other implementations have opted for the proposed behaviour, and shells (e.g. bash) may autocomplete directories with a trailing slash, the current implementation may cause both scripting portability issues and interactive misuse.
In all the src/ tree only two instances of cp -R needed to be adapted.