@Override
    public String toString() {
        double value = getValue(displayUnit);
        String integer = String.format(Locale.ENGLISH, "%d", (long) value);
        String decimal = String.format(Locale.ENGLISH, "%.2f", value);
        if (decimal.equals(integer + ".00")) {
            return integer + displayUnit.getUnitString();
        } else {
            return decimal + displayUnit.getUnitString();
        }
    }
Parses and formats byte size representations, such as "4MB", "83GB".

<p>This class is deprecated, to be removed in plan. Any plugin should not use it.
embulk-core/src/main/java/org/embulk/spi/unit/ByteSize.java