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// 32 bit FNV-1a hash
// Ref.: http://isthe.com/chongo/tech/comp/fnv/
function fnv32a( str )
{
  var FNV1_32A_INIT = 0x811c9dc5;
  var hval = FNV1_32A_INIT;
  for ( var i = 0; i < str.length; ++i )
  {
    hval ^= str.charCodeAt(i);
    hval += (hval << 1) + (hval << 4) + (hval << 7) + (hval << 8) + (hval << 24);
  }
  return hval >>> 0;
}