Use of long in Nashorn

[Hannes Wallnoefer]

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 
meantime):

https://bugs.openjdk.java.net/browse/JDK-8065910

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)?

Hannes