Verify the correct handling of Unicode escaping
Verify the correct handling of Unicode escaping

Check that JsonParser correctly handles Unicode characters escaped
using the \uXXXX notation, as per RFC.

ebassi/json-glib,oerdnj/json-glib,GNOME/json-glib,ebassi/json-glib,oerdnj/json-glib,robtaylor/json-glib-gvariant,oerdnj/json-glib,brauliobo/json-glib,frida/json-glib,Distrotech/json-glib,brauliobo/json-glib,Distrotech/json-glib,oerdnj/json-glib,frida/json-glib,Distrotech/json-glib,brauliobo/json-glib,GNOME/json-glib,ebassi/json-glib,robtaylor/json-glib-gvariant