doppio sounds awesome.  from the paper:<p>Numeric support. Direct support for 64-bit integers would enable
languages to efficiently represent a broader range of numeric types
in the browser. The DOPPIOJVM uses a comprehensive software
implementation of 64-bit integers to bring the long data type into
the browser, but it is extremely slow when compared to normal
numeric operations in JavaScript.<p>--<p>how far is this from being solved?