Mismatch

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Z←L≢R returns a Boolean scalar identical to ~L≡R.
L and R are both arbitrary arrays.
Z is a Boolean scalar whose value is 1 if the two arguments differ in any respect be it depth, rank, shape or value, and 0 otherwise.


For example, in origin-1

      ''≢⍬
1
      1 2 3≢⍳3
0