> The value is given by the initial portion of the string.
> If the string starts with valid numeric data, this will
> be the value used. Otherwise, the value will be 0 (zero).
> Valid numeric data is an optional sign, followed by one
> or more digits (optionally containing a decimal point),
> followed by an optional exponent. The exponent is an 'e'
> or 'E' followed by one or more digits.
Also:
> If you compare a number with a string or the comparison
> involves numerical strings, then each string is converted
> to a number and the comparison performed numerically.
