`G_DEFINE_DYNAMIC_TYPE_EXTENDED` causes warnings with -Wcast-function-type

G_DEFINE_DYNAMIC_TYPE_EXTENDED declares:

static void     type_name##_class_finalize    (TypeName##Class *klass);

and casts it with (GClassFinalizeFunc) to be placed in the GTypeInfo, but this type is:

void
(*GClassFinalizeFunc) (gpointer g_class,
                       gpointer class_data);

which causes warnings like:

file.c:60:1: note: in expansion of macro ‘G_DEFINE_DYNAMIC_TYPE_EXTENDED’
 G_DEFINE_DYNAMIC_TYPE_EXTENDED(
 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/glib-2.0/gobject/gtypemodule.h:208:5: warning: cast between incompatible function types from ‘void (*)(...Class *)’ {aka ‘void (*)(struct _...Class *)’} to ‘void (*)(void *, void *)’ [-Wcast-function-type]
     (GClassFinalizeFunc) type_name##_class_finalize, \
     ^

which are triggered by meson -Dwarning_level=2.

Similar warnings arise for the other type methods. Perhaps applying some double-casts like !82 (merged) might help?