void value_set_missing (union value *, int width);
int value_compare_3way (const union value *, const union value *, int width);
bool value_equal (const union value *, const union value *, int width);
-size_t value_hash (const union value *, int width, unsigned int basis);
+unsigned int value_hash (const union value *, int width, unsigned int basis);
bool value_is_resizable (const union value *, int old_width, int new_width);
bool value_needs_resize (int old_width, int new_width);