dschoon

    var o = { a:13, add:function(b){ return this.a + b; } };
    o.add(42); // => `55`
    var add = o.add;
    add(42); // => `NaN`, because `this.a` is (presumably) `undefined`
    var a = 3;
    add(42); // => `45`, because `this.a` is resolved to `window.a`, as `window` is the global variable used as the method context when we call an unbound function (which is stupid (`null` would have been a way better choice, Brandon)).

    #define sin(d) ((double)sinf(d))

    double i =  10
    --> i    =  10.0000000000
    sin(i)   = -0.5440211109
    sinf(i)  = -0.5440211296
    delta    =  0.0000000187
    
    double i =  0.25
    --> i    =  0.2500000000
    sin(i)   =  0.2474039593
    sinf(i)  =  0.2474039644
    delta    = -0.0000000051
    
    double i = 9999999.999999
    --> i    = 9999999.9999989998
    sin(i)   =  0.4205487007
    sinf(i)  =  0.4205478132
    delta    =  0.0000008875

   Compressor  Size  Ratio  Time
   gzip -1     23MB  88%     1.18s
   gzip -2     23MB  87%     1.38s
   bzip2       23MB  87%     5.57s
   xz -1       23MB  87%     5.35s
   xz -9       11MB  43%    10.58s
   bmz         13MB  45%     0.95s