Hi Bug apl,
it seems that format adds fuzz after a certain point.
a←0.00000000000000000000000000000000000000000001
'0.000000000000000000000000000000000000000000000000000000000000 '⍕a
0.000000000000000000000000000000000000000000010000000000000000
'0.0000000000000000000000000000000000000000000000000000000000000 '⍕a
0.0000000000000000000000000000000000000000000099999999999999995
'0.000000000000000000000000000000000000000000000000000000000000 '⍕a
0.000000000000000000000000000000000000000000010000000000000000
'0.0000000000000000000000000000000000000000000000000000000000000 '⍕a
0.0000000000000000000000000000000000000000000099999999999999995
-Alex
