sto property Null safety
Implementation
CalculatorButton get sto => CalculatorButton(factory, 'STO', 'WSIZE', '<',
Operations16.sto, Operations16.wSize, Operations16.windowRight, 'S<');
CalculatorButton get sto => CalculatorButton(factory, 'STO', 'WSIZE', '<',
Operations16.sto, Operations16.wSize, Operations16.windowRight, 'S<');