cpp11 breaking changes

cran

4 curated breaking changes across major versions of cpp11. Use this as a migration checklist before bumping dependencies.

changes

Breaking changes by transition

v0.4.7 \u2192 v0.5.0breaking
R >=3.6.0 is now required. This is in line with (and even goes beyond) the tidyverse standard of supporting the previous 5 minor releases of R.
v0.4.7 \u2192 v0.5.0breaking
Implicit conversion from `sexp` to `bool`, `size_t`, and `double` has been marked as deprecated and will be removed in the next version of cpp11. The 3 packages that were using this have been notified and sent PRs. The recommended approach is to instead use `cpp11::as_cpp<T>`, which performs type and length checking, making it much safer to use.
v0.4.7 \u2192 v0.5.0breaking
Dropped support for gcc 4.8, mainly an issue for extremely old CentOS 7 systems which used that as their default compiler. As of June 2024, CentOS 7 is past its vendor end of support date and therefore also out of scope for Posit at this time (#359).
v0.2.7 \u2192 v0.3.0breaking
Memory no longer inadvertently leaks when move constructing vectors (#173)

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