56As regards, in the third place, Articles 20 and 21 of the Charter, it must be observed that a difference of treatment based on whether the employment relationship is statutory or contractual may, in principle, be assessed with regard to the principle of equal treatment, which is a general principle of EU law, now enshrined in Articles 20 and 21 of the Charter (see, to that effect, the judgment of 9 March 2017, Milkova, C‑406/15, EU:C:2017:198, paragraphs 55 to 63).
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