DS24B33/DS2431 eeprom

@DrAzzy yes, and you can actually do it on an existing buffer, so for instance:

var a=new Uint8Array(12);
var f = new Float32Array(a.buffer,0,2);
f[0] = ...;
f[1] = ...;
(new Uint32Array(a.buffer,8,1))[0] = ...;
console.log(a);

I guess you could do:

AT24.prototype.aToN=function(a){return (new Uint32Array((new Uint8Array(a)).buffer))[0];}

And another nice one - although you don't use sToA:

function stoA(s) {
  var a = new Uint8Array(s.length);
  a.set(s); // I don't think passing a string into set is standard JS though!
  return a;
}