Fix ambiguous py::str(kwargs) overload on GCC

Author: Mohataseem89

include/pybind11/pytypes.h

@@ -1640,6 +1640,11 @@ class str : public object {
     str(std::u8string_view s) : str(reinterpret_cast<const char *>(s.data()), s.size()) {}
 #    endif
 
+    // Avoid ambiguity when converting from kwargs (GCC)
+    explicit str(const kwargs &k)
+        : str(static_cast<handle>(k)) {}
+
+
 #endif
 
     explicit str(const bytes &b);

tests/test_pytypes.cpp

@@ -1212,3 +1212,10 @@ TEST_SUBMODULE(pytypes, m) {
         return py::isinstance<RealNumber>(x);
     });
 }
+
+
+TEST_SUBMODULE(pytypes, kwargs_str) {
+    m.def("kwargs_to_str", [](py::kwargs kwargs) {
+        return py::str(kwargs);
+    });
+}