BigNumber Constructor

/**
 * Creates a new BigNumber instance
 * @param {string|number|BigNumber.Instance} n - The numeric value
 * @param {number} [base] - The base of n (2-36), default 10
 * @returns {BigNumber} New BigNumber instance
 */
new BigNumber(n, base)

// From numbers
const x = new BigNumber(123.4567);
const y = new BigNumber(-0.8);
const z = new BigNumber(Infinity);

// From strings
const a = new BigNumber('123.4567');
const b = new BigNumber('-735.0918e-430');
const c = new BigNumber('0xff');  // hex literal
const d = new BigNumber('-0b10110100.1');  // binary literal

// From other BigNumbers
const copy = new BigNumber(x);

// With base conversion
const hex = new BigNumber('ff.8', 16);      // 255.5
const binary = new BigNumber('-10110100.1', 2);  // -180.5
const base5 = new BigNumber('123412421.234324', 5);  // 607236.557696

// Special values
const nan = new BigNumber(NaN);
const negInf = new BigNumber('-Infinity');
const negZero = new BigNumber(-0);  // becomes '0'

/**
 * Creates BigNumber from object literal
 * @param {object} obj - Object with s, e, c, _isBigNumber properties
 * @returns {BigNumber} New BigNumber instance
 */
new BigNumber({ s: number, e: number, c: number[], _isBigNumber: true })

// Create from object literal (advanced usage)
const bn = new BigNumber({ 
  s: 1, 
  e: 2, 
  c: [777, 12300000000000], 
  _isBigNumber: true 
});  // '777.123'

// Verify object is well-formed
BigNumber.isBigNumber(bn);  // true

BigNumber.DEBUG = true;
new BigNumber('invalid');  // throws error instead of returning NaN
new BigNumber(12345678901234567);  // throws error for >15 digits

// Error examples
new BigNumber('blurgh');     // 'NaN' (or error if DEBUG=true)
new BigNumber(9, 2);         // 'NaN' (9 invalid in base 2)
new BigNumber('1e500000');   // May return 'Infinity' based on RANGE setting