Commits on Feb 6, 2013

1. typed arrays: only share ArrayBuffer backing store …

   Follow browser behavior, only share the backing store when it's a
   ArrayBuffer. That is:
   
     var abuf = new ArrayBuffer(32);
     var a = new Int8Array(abuf);
     var b = new Int8Array(abuf);
     a[0] = 0;
     b[0] = 1;
     assert(a[0] === b[0]);  // a and b share memory
   
   But:
   
     var a = new Int8Array(32);
     var b = new Int8Array(a);
     a[0] = 0;
     b[0] = 1;
     assert(a[0] !== b[0]);  // a and b don't share memory
   
   The typed arrays spec allows both `a[0] === b[0]` and `a[0] !=== b[0]`
   but Chrome and Firefox implement the behavior where memory is not
   shared.
   
   Copying the memory is less efficient but let's do it anyway for the
   sake of the Principle of Least Surprise.
   
   Fixes #4714.

   

   bnoordhuis committed Feb 6, 2013
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