power(2,63) is not equal to 9223372036854775808

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Following on from this discussion about the tokeniser's handling of 9223372036854775808: 

Euphoria Interpreter v4.1.0 development 
   64-bit Windows, Using System Memory 
   Revision Date: 2015-02-02 14:18:53, Id: 6300:57179171dbed 


print(1,  power(2,63) - 9223372036854775808)

Should equal zero, right? 

1.844674407e+019
So until this is fixed we need to use power(2,63) instead of 9223372036854775808 on those rare occasions

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