A repeated typo is causing all of the isIntX definitions to be wrong

[rwaldron]

I'll only copy isInt8, because they all have the same issue, so no reason to repeat myself:

Number.isInt8(arg) Returns true if Number.isNumber(arg) is true and arg is an 8-bit signed integer in the range -2^7 <= arg <= -2^7-1.

When implemented as shown:

function isInt8(arg) {
  return (-Math.pow(2, 7)) <= arg <= (-Math.pow(2, 7) - 1);
}

isInt8(255) === false;
isInt8(127) === false;
isInt8(120) === false;
isInt8(1) === false;
isInt8(-1) === false;

This can likely be rolled into the fixes for #11, eg:

Number.isInt8(arg)

1. If Type(arg) is Number and arg is an integer in the range -2⁷ through 2⁷-1, inclusive, return true.
2. Return false.

[rwaldron]

Note that there are two defects:

• The incorrect relational operator for the comparison of the lower boundary and arg
  • For both isInt and isUint
• The negative upper boundary
  • Only isInt

[jasnell]

Sigh. Sorry about that. That's what I get for not proofreading

[rwaldron]

Don't sweat it! All quick fixes :)