For Symbols, `==` is exactly same as `===`

sym_equal_definition

// string.c in ruby-1.9.3-p125 src

7896     rb_define_method(rb_cSymbol, "==", sym_equal, 1);
7897     rb_define_method(rb_cSymbol, "===", sym_equal, 1);

7395 static VALUE
7396 sym_equal(VALUE sym1, VALUE sym2)
7397 {
7398     if (sym1 == sym2) return Qtrue;
7399     return Qfalse;
7400 }