Require the underscore delimiter for numbers over 9000

[coolaj86]

Bad Examples

let cost = 10000;

let max = 9007199254740991;

Good Examples

let cost = 100_00; // $100.00 in cents

let max = 9_007_199_254_740_991; // a number in the quadrillions

FAQ

What about hex?

0x1001_1001

Hex doesn't preserve leading zeros 0x0000 === 0x00 === 0x0 and BigInt is its own special syntax 0x0123456789ABCDEF0123456789ABCDEFn, so the same rules apply for non-BigInt Hex and Octal as for decimal.

What about binary?

Hmm... have to think on that one. Possible the same rules for the same reason above.

8-bit bytes though...

0b10001000_10001000_10001000_1000100

0b10001000_10001000_10001000_1000100n