NumberSymbols constructor 
    
      const
      NumberSymbols({ - required String NAME, 
 
- required String DECIMAL_SEP, 
 
- required String GROUP_SEP, 
 
- required String PERCENT, 
 
- required String ZERO_DIGIT, 
 
- required String PLUS_SIGN, 
 
- required String MINUS_SIGN, 
 
- required String EXP_SYMBOL, 
 
- required String PERMILL, 
 
- required String INFINITY, 
 
- required String NAN, 
 
- required String DECIMAL_PATTERN, 
 
- required String SCIENTIFIC_PATTERN, 
 
- required String PERCENT_PATTERN, 
 
- required String CURRENCY_PATTERN, 
 
- required String DEF_CURRENCY_CODE, 
 
})
    
    
    
  Implementation
  const NumberSymbols(
    {required this.NAME,
    required this.DECIMAL_SEP,
    required this.GROUP_SEP,
    required this.PERCENT,
    required this.ZERO_DIGIT,
    required this.PLUS_SIGN,
    required this.MINUS_SIGN,
    required this.EXP_SYMBOL,
    required this.PERMILL,
    required this.INFINITY,
    required this.NAN,
    required this.DECIMAL_PATTERN,
    required this.SCIENTIFIC_PATTERN,
    required this.PERCENT_PATTERN,
    required this.CURRENCY_PATTERN,
    required this.DEF_CURRENCY_CODE});