Integer printing error for small numbers

[axfree]

If the number is floating point number and its exponent is in certain range, sprintf prints wrong number.

var a = 9.9999e-7;

console.log(a);
// ==> 9.9999e-7

console.log(sprintf('%d', a));
// ==> 9 (0 expected)

console.log(sprintf('%d', a + 0.0001));
// ==> 0

console.log(sprintf('%d', a.toFixed()));
// ==> 0

console.log(parseInt(a));
// ==> 9

console.log(parseInt(a.toFixed()));
// ==> 0

To fix this, if the type specifier is integer (/bcdiuxX/), arg must first be converted to the fixed point number using toFixed(). toFixed() also does the rounding which is also desired.

[rustafaria]

sprintf isn't doing the right thing when the toString is printed as exponential. exp <= -7 and exp >= 21 cause this problem