limit←{             ⍝ Function power limit (fixpoint).
    ⍵ ⍺⍺{           ⍝ 'old' value:
        ⍺≡⍵:⍵       ⍝       old matches new: finished.
        ⍵ ∇ ⍺⍺ ⍵    ⍝       otherwise: try new value.
    }⍺⍺ ⍵           ⍝ 'new' value.
}

test script

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