Is there a bignum built into JavaScript or browsers?

The alternate is loading an external library like

<script type="text/javascript" src="the_bignum_library.js"></script>

but that seems slow and may trigger a security warning.

I've considered basing my own off of http://github.com/silentmatt/javascript-biginteger or http://www.mainebrook.com/john/fun/euler.html. Alternately, is the solution to call into a Java bignum library such as apfloat?

javascript floating-accuracy bignum
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