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Barb (`⥊`)
`⥊ 𝕩`: Deshape
Put all elements of `𝕩` in a rank 1 array, converting to array if necessary.
```
⥊ 1
⟨ 1 ⟩
⥊ 1‿2 ≍ 3‿4
⟨ 1 2 3 4 ⟩
```
`𝕨 ⥊ 𝕩`: Reshape
Put all elements of `𝕩` in an array of shape `𝕨`, adding or removing elements if necessary.
A single element in `𝕩` can be a function, which will be replaced with an appropriate length:
- `∘` Exact fit
- `⌊` Round length down, discarding elements
- `⌽` Round length up
- `↑` Round length up, and use element fill to add extra elements.
```
3‿3 ⥊ 3
┌─
╵ 3 3 3
3 3 3
3 3 3
┘
2‿⌽‿2 ⥊ 1‿2‿3
┌─
╎ 1 2
3 1
┘
2‿↑‿2 ⥊ 1‿2‿3
┌─
╎ 1 2
3 0
┘
```
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