What about throwing for invalid input?

[safareli]

Maybe provide "safe" constructor which checks if input is valid first, or something other then returning invalid values like this:

> var BN = require('bn.js');
> (new BN("10", 10)).toString(10)
'10'
> (new BN("asdads", 10)).toString(10)
'1294158'
> (new BN("-----bla", 10)).toString(10)
'--3331680'
> (new BN("!@#!@#@!#!@-----bla", 10)).toString(10)
'-135390-533285undefined-2452320'
> (new BN("-135390-533285undefined-2452320", 10)).toString(10)
'-135389753328824457045272452320'

[therightstuff]

@indutny @dcousens This issue has been resolved for a while, could you please create a new release that includes the fix?