Method equals

extern/sol3/sol/stack_reference.hpp:123–125

		}

		bool equals(lua_State* L_, const stateless_stack_reference& r) const noexcept {
			return lua_compare(L_, this->stack_index(), r.stack_index(), LUA_OPEQ) == 1;
		}

		bool equals(lua_State* L_, lua_nil_t) const noexcept {
			return valid(L_);