Saves the list in text format, convenient for human read. Loading of this format is not supported.
The fractional part of a real number "x" is the excess beyond that number's integer part.
For a number its fractional part hence corresponds to the digits appearing after the radix point.
For example:
x = 123.456; {x} = 0.456
x = -123.456; {x} = -0.456
The maximum limit for a possible offset.