Duplicate constant value

[biggianteye]

The Parameter::MINUS_WEIGHT and Parameter::UNDERWEIGHT constants both have a value of 32. It's unclear where these numbers come from and therefore hard to determine if this is correct ir not.

One consequence of this is that the Parameter::idToName array has duplicate indexes for the above constants.

Neither constant appears to be explicitly used by the library at the moment.

    const MINUS_WEIGHT = 32;
    // <skip>
    const UNDERWEIGHT = 32;

    /** @var string[] */
    private static $idToName = [
        // <skip>
        self::MINUS_WEIGHT => 'Minus weight',
        // <skip>
        self::UNDERWEIGHT => 'Underweight'
    ];