This looks like it was deliberate (and probably saves a status bit in the internal representation), but it's still concerning:
f=: {{ y {{ x - y }} x}}
F=: {{ y - x }}
1 2 3 f 3 2 1
2 0 _2
1 2 3 F 3 2 1
2 0 _2
0!:0 'G=:',5!:5 <'F'
G
4 : 'y-x'
0!:0 'G=:',5!:5 <'f'
|spelling error
FYI,
--
Raul
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