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Slice rectangle from an array with pixels.

### `clip(arr, shape=[w, h?, channels=4], rect=[x, y?, w?, h?])`

```js
var clip = require('clip-pixels')

var pixels = [
0, 1, 0,
1, 1, 1,
0, 1, 0
]
pixels = clip(pixels, [3, 3, 1], [1, 0, 2, 3])

/*
1, 0,
1, 1,
1, 0
*/
```