Literals: Range
Range
A Range is typically constructed with a range literal:
x..y # an inclusive range, in mathematics: [x, y] x...y # an exclusive range, in mathematics: [x, y)
An easy way to remember which one is inclusive and which one is exclusive it to think of the extra dot as if it pushes y further away, thus leaving it outside of the range.
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https://crystal-lang.org/docs/syntax_and_semantics/literals/range.html
