JavaScript Primitive Numbers have Fixed Precision

FixedPrecisionProblems.js

// Numbers with many significant figures may be truncated:

var primitive = 2.00000000000000000000000000000000000001;

// Immediately after creation, the low digits are truncated away.

primitive;
// = 2

// Performing math on primitives will not include truncated digits.

primitive * 2;
// = 4

// In the case of PI, only 16 digits are preserved.

var pi = 3.1415926535897932384626433832795028841971693993751058209749445923078164062; // ...

pi;
// = 3.141592653589793