chore: add a couple of moves in pybind11.h (#3941)

* Add missing std::moves in enum_base methods

* Remove useless move

* Add one more std::move in print

* Further optimize print

* Some more misc optimizations

Author: Skylion007

include/pybind11/pybind11.h

@@ -1926,7 +1926,8 @@ struct enum_base {
             [](const object &arg) -> str {
                 handle type = type::handle_of(arg);
                 object type_name = type.attr("__name__");
-                return pybind11::str("<{}.{}: {}>").format(type_name, enum_name(arg), int_(arg));
+                return pybind11::str("<{}.{}: {}>")
+                    .format(std::move(type_name), enum_name(arg), int_(arg));
             },
             name("__repr__"),
             is_method(m_base));
@@ -1936,7 +1937,7 @@ struct enum_base {
         m_base.attr("__str__") = cpp_function(
             [](handle arg) -> str {
                 object type_name = type::handle_of(arg).attr("__name__");
-                return pybind11::str("{}.{}").format(type_name, enum_name(arg));
+                return pybind11::str("{}.{}").format(std::move(type_name), enum_name(arg));
             },
             name("name"),
             is_method(m_base));
@@ -2576,8 +2577,8 @@ PYBIND11_NOINLINE void print(const tuple &args, const dict &kwargs) {
     for (size_t i = 0; i < args.size(); ++i) {
         strings[i] = str(args[i]);
     }
-    auto sep = kwargs.contains("sep") ? kwargs["sep"] : cast(" ");
-    auto line = sep.attr("join")(strings);
+    auto sep = kwargs.contains("sep") ? kwargs["sep"] : str(" ");
+    auto line = sep.attr("join")(std::move(strings));
 
     object file;
     if (kwargs.contains("file")) {
@@ -2596,7 +2597,7 @@ PYBIND11_NOINLINE void print(const tuple &args, const dict &kwargs) {
 
     auto write = file.attr("write");
     write(line);
-    write(kwargs.contains("end") ? kwargs["end"] : cast("\n"));
+    write(kwargs.contains("end") ? kwargs["end"] : str("\n"));
 
     if (kwargs.contains("flush") && kwargs["flush"].cast<bool>()) {
         file.attr("flush")();
@@ -2639,7 +2640,7 @@ get_type_override(const void *this_ptr, const type_info *this_type, const char *
 
     function override = getattr(self, name, function());
     if (override.is_cpp_function()) {
-        cache.insert(key);
+        cache.insert(std::move(key));
         return function();
     }