Dyalog partitioned-enclose, e.g. 1 0 0 1 0 0 ⊂ 'abcdef' turns into boxed [abc] [def], but Nars2000 and ngn/apl both turn it into a d and that feels like it's just doing part of what replicate would do.
I guess they're both valid different interpretations rather than bugs, but .. why are they different?
@TessellatingHeckler i'm not sure what the order of events was. iirc, dyalog (or its predecessor dyadic ltd) had already released some versions before the apl2 spec was complete.