+static inline size_t value_cnt_from_width (int width);
+void value_copy (union value *, const union value *, int width);
+void value_set_missing (union value *, int width);
+bool value_is_resizable (const union value *, int old_width, int new_width);
+void value_resize (union value *, int old_width, int new_width);
+int value_compare_3way (const union value *, const union value *, int width);