map.put("パ", new String[] { "pa" });
        map.put("ピ", new String[] { "pi" });
        map.put("プ", new String[] { "pu" });
        map.put("ペ", new String[] { "pe" });
        map.put("ポ", new String[] { "po" });

        map.put("ヴァ", new String[] { "va" });
        map.put("ヴィ", new String[] { "vi" });
        map.put("ヴ", new String[] { "vu" });
        map.put("ヴェ", new String[] { "ve" });

func parsePostPolicyForm(r io.Reader) (PostPolicyForm, error) {
	reader, err := sanitizePolicy(r)
	if err != nil {
		return PostPolicyForm{}, err
	}

	d := json.NewDecoder(reader)

	// Convert po into interfaces and
	// perform strict type conversion using reflection.
	var rawPolicy struct {
		Expiration string `json:"expiration"`
		Conditions []any  `json:"conditions"`
	}

	d.DisallowUnknownFields()