Merge branch 'develop' into techdebt/5708-meta-cleanup

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

include/nlohmann/detail/macro_unscope.hpp

@@ -8,11 +8,6 @@
 
 #pragma once
 
-// restore clang diagnostic settings
-#if defined(__clang__)
-    #pragma clang diagnostic pop
-#endif
-
 // clean up
 #undef JSON_ASSERT
 #undef JSON_INTERNAL_CATCH
@@ -25,6 +20,7 @@
 #undef JSON_INLINE_VARIABLE
 #undef JSON_NO_UNIQUE_ADDRESS
 #undef JSON_DISABLE_ENUM_SERIALIZATION
+#undef JSON_DISABLE_TUPLE_REFERENCE_CONVERSION
 
 #ifndef JSON_TEST_KEEP_MACROS
     #undef JSON_CATCH