Fix as<std::string> based on JohelEGP feedback

include/cpp2util.h

@@ -928,12 +928,13 @@ inline auto to_string(std::same_as<std::any> auto const&) -> std::string
     return "std::any";
 }
 
-inline auto to_string(bool b) -> std::string
+inline auto to_string(std::same_as<bool> auto b) -> std::string
 {
     return b ? "true" : "false";
 }
 
 template<typename T>
+    requires (!std::same_as<T, bool>)
 inline auto to_string(T&& t) -> std::string
     requires requires { std::to_string(t); }
 {
@@ -945,7 +946,8 @@ inline auto to_string(char const& t) -> std::string
     return std::string{t};
 }
 
-inline auto to_string(char const* s) -> std::string
+template <std::same_as<char const*> X>
+inline auto to_string(X& s) -> std::string
 {
     return std::string{s};
 }
@@ -1037,19 +1039,13 @@ inline auto to_string(auto&& value, std::string_view) -> std::string
 template <typename T>
 concept has_to_string_overload = requires{ static_cast<std::string (*)(T const&)>(&to_string); };
 
-template< std::same_as<std::string> C, non_string X>
+template< std::same_as<std::string> C, typename X>
     requires has_to_string_overload<X>
 auto as( X&& x) -> C
 {
     return cpp2::to_string(CPP2_FORWARD(x));
 }
 
-template< std::same_as<std::string> C>
-auto as(bool x) -> C
-{
-    return cpp2::to_string(x);
-}
-
 template< std::same_as<std::string> C, std::size_t N>
 auto as(const char (&x)[N]) -> C
 {