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max 

        # Array.max

(from ruby core)
---
    array.max -> element
    array.max {|a, b| ... } -> element
    array.max(n) -> new_array
    array.max(n) {|a, b| ... } -> new_array

---

Returns one of the following:
*   The maximum-valued element from `self`.
*   A new Array of maximum-valued elements selected from `self`.


When no block is given, each element in `self` must respond to method
`<=>` with an Integer.

With no argument and no block, returns the element in `self` having the
maximum value per method `<=>`:
    [0, 1, 2].max # => 2

With an argument Integer `n` and no block, returns a new Array with at
most `n` elements, in descending order per method `<=>`:
    [0, 1, 2, 3].max(3) # => [3, 2, 1]
    [0, 1, 2, 3].max(6) # => [3, 2, 1, 0]

When a block is given, the block must return an Integer.

With a block and no argument, calls the block `self.size-1` times to
compare elements; returns the element having the maximum value per the
block:
    ['0', '00', '000'].max {|a, b| a.size <=> b.size } # => "000"

With an argument `n` and a block, returns a new Array with at most `n`
elements, in descending order per the block:
    ['0', '00', '000'].max(2) {|a, b| a.size <=> b.size } # => ["000", "00"]

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