First encountered by Ralf on #15625, Sage can't translate back from GAP 
with eval for extremely large numbers:
sage: ans=gap.eval("Lucas(%s,%s,%s)[1]"%(1,-1,100))
sage: ans
'354224848179261915075'
sage: ans=gap.eval("Lucas(%s,%s,%s)[1]"%(1,-1,100000))
sage: ans
'<integer 259...875 (20899 digits)>'

although this does work for 
gap.Lucas(1,-1,100000)

Is there someway we could translate the eval() output back into a Sage 
integer? Also more generally, should we keep using gap.eval() in Sage code 
or gap.explicit_function()?

Best,
Travis

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