Avoid implicit conversion from sexp to bool
#543
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cpp11 allows some somewhat scary implicit conversions between
sexpand the 3 typesbool,size_t, anddouble. These are unchecked conversions, and we'd like to remove them:r-lib/cpp11#390
The recommended way is to use
cpp11::as_cpp<bool>(), which checks the type and length before performing the conversion.I'm not going to remove these in this version of cpp11, but we will in the next