===(p1)
public
Case Equality – For class Object, effectively the same as calling #==, but
typically overridden by descendants to provide meaningful semantics in
case statements.
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VALUE
rb_equal(VALUE obj1, VALUE obj2)
{
VALUE result;
if (obj1 == obj2) return Qtrue;
result = rb_funcall(obj1, id_eq, 1, obj2);
if (RTEST(result)) return Qtrue;
return Qfalse;
}