final public static function validateNumericFields (array $fields=[], string $option, string $field) : bool
	{
		$fieldsWithError 	= "";
		$field 				= static::checkGlobal($field);
		foreach ($fields as $fieldName => $length)
		{
			$value = static::setValueNull($field[$fieldName]);
			if ($value !== NULL) {
				$options = [$option => $length];
				if (!static::hasNumber($value, $options))
					$fieldsWithError .= "'".fieldNameAsText($fieldName)."', ";
			}
		}
		static::setError($fieldsWithError);
		return static::checkError();
	}