Use of long in Nashorn

Hannes Wallnoefer hannes.wallnoefer at
Fri Nov 13 09:31:04 UTC 2015

Hi all,

I'm currently questioning our use of longs to represent numbers in 
combination with optimistic typing. After all, there's a pretty large 
range where long arithmetic will be more precise than the doubles 
required by ECMA.

For context see this bug, especially the last two comments (the original 
bug was about number to string conversion which has been solved in the 

So the question is: can we use longs at all and be confident that 
results won't be too precise (and thus, strictly speaking, incorrect)?


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