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Equal (`=`) `= 𝕩`: Rank Returns the number of dimensions in `𝕩`. ``` = 0 0 = 3⥊0 1 = 3‿3⥊0 2 3‿3‿3 ⥊ ⟨⟨0⟩⟩ 3 ``` `𝕨 = 𝕩`: Equal To [Pervasive.](https://mlochbaum.github.io/BQN/doc/arithmetic.html#pervasion) ``` 1 = 3 0 2‿3‿0 = 3‿1‿0 ⟨ 0 0 1 ⟩ 'a' = 'a' 1 ```