Having two or more indirect conventions will make proxy 8 bytes larger than expected in MSVC #123
Description
The following code compiles with clang and GCC, but won't compile with MSVC:
#include <proxy/proxy.h>
PRO_DEF_MEM_DISPATCH(MemFoo, Foo);
PRO_DEF_MEM_DISPATCH(MemBar, Bar);
struct F : pro::facade_builder
::add_convention<MemFoo, void()>
::add_convention<MemBar, void()>
::build {};
int main() {
static_assert(sizeof(pro::proxy<F>) == 3 * sizeof(void*));
}Affected by a bug in MSVC: https://developercommunity.visualstudio.com/t/C-attribute-msvc::no_unique_address/10688578