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Regular Expressions (thanks to @Pomierski)

You can now use the regular expression type to narrow string values.

const const email: RegExp<(?:[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*|"(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21\x23-\x5b\x5d-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])*")@(?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?|\[(?:(?:(2(5[0-5]|[0-4][0-9])|1[0-9][0-9]|[1-9]?[0-9]))\.){3}(?:(2(5[0-5]|[0-4][0-9])|1[0-9][0-9]|[1-9]?[0-9])|[a-z0-9-]*[a-z0-9]:(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21-\x5a\x53-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])+)\])> = "mymail@mail.com"!

To avoid confusion, you can use any spelling that you want, such as 'Regex' or 'RegularExpression'. For reference, all supported regular expressions match the regular expression /Reg(ular)?[eE]xp?(ression)?/.

Naming (thanks to @karolstawowski and @OsaidAlhomedy)

Variables and constants can now be named with any Unicode character or string.

const const firstAlphabetLetter = 'A'!
var const 👍 = True!
var var 1️⃣ = 1! 

This includes numbers, and other language constructs.

const const 5 = 4!
print(2 + 2 === 5)! //true