from_sentence : the opposite of Rails to_sentence

I like the Rails to_sentence method on String class, which converts an array to a comma-separated sentence where the last element is joined by a connector word.

It makes it easy to take a list of names, for example, and make them human-readable, without having to fiddle with join words and last-item-is-special-case stuff:

['one', 'two'].to_sentence          # => "one and two"
['one', 'two', 'three'].to_sentence # => "one, two, and three"

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