A @Scientific@ number is an arbitrary-precision floating-point number
represented using scientific notation.
A scientific number with 'coefficient' @c@ and
'base10Exponent' @e@ corresponds to the
'Fractional' number: @'fromInteger' c * 10 '^^' e@
Its primary use-case is to serve as the target of
parsing floating point numbers. Since the textual
representation of floating point numbers use
scientific notation they can be efficiently
parsed to a @Scientific@ number.