Readable constructor
Constructs a Readable instance with the given size, type, and
optional fractionDigits.
size: The numeric value to be formatted.type: The unit of the value (e.g., KB, MB).fractionDigits: The number of decimal places to include. Default is 1.
Implementation
const Readable(
this.size,
this.type, [
this.fractionDigits = 1,
]);