From: https://code.jsoftware.com/wiki/Essays/Fibonacci_Sequence
f0b=: (-&2 +&$: -&1) ^: (1&<) M.
f2a=: 3 : '{. +/\@|.^:y 0 1x'
x:f0b 98
135301852344706760704
x:f2a 98
135301852344706746049
(x:f0b 98) -: x:f2a 98
0
Why the discrepancy?
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