[Rails] can someone explain how map! / connect! works in this case?

I just don't get it, how does it know which value to write out? If I
change the array number say to 10 instead of three and change the word
"three" to "ten" in the block it comes as nil... is there something
special about 1..3 that I am missing?

ary = [0,1,1,1,1,3]
ary.map! { |num| %w(zero one two three)[num] }

p ary
["zero", "one", "one", "one", "one", "three"]

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