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upto 

        # Integer.upto

(from ruby core)
---
    upto(limit) {|i| ... } -> self
    upto(limit)            ->  enumerator

---

Calls the given block with each integer value from `self` up to `limit`;
returns `self`:

    a = []
    5.upto(10) {|i| a << i }              # => 5
    a                                     # => [5, 6, 7, 8, 9, 10]
    a = []
    -5.upto(0) {|i| a << i }              # => -5
    a                                     # => [-5, -4, -3, -2, -1, 0]
    5.upto(4) {|i| fail 'Cannot happen' } # => 5

With no block given, returns an Enumerator.

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