Math
exclusive: [a..b), inclusive: [a..b]
Haskell
exclusive: <none>, inclusive: a..b
Elixir
exclusive: <none>, inclusive: a..b
Ruby
exclusive: a...b, inclusive: a..b
Swift
exclusive: a..<b, inclusive: a...b
Rust
exclusive: a..b, inclusive: a...b
Language designers be trolling. ¯\_(ツ)_/¯