- for floating point values, number of digits after decimal point ('`f`' or
'`F`' presentation) or number of significant digits ('`g`' or '`G`')
- for others, maximum field size (truncate subsequent characters)
- for floating point values, number of digits after decimal point ('`f`' or
'`F`' presentation) or number of significant digits ('`g`' or '`G`')
- for others, maximum field size (truncate subsequent characters)