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ajeffrey@roblox.com 2022-10-18 16:22:05 -05:00
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docs/_posts/2022-10-31-luau-semantic-subtyping.md
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@ -29,7 +29,7 @@ While inaccuracies are inevitable, we try to remove them whenever possible, sinc
## Subtyping as a source of false positives
One of the sources of false positives in Luau (and many other similar languages like TypeScript or Flow) is *subtyping*. Subtyping is used whenever a variable is initialized or assigned to, and whenever a function is called: the type system checks that the type of the expression is a subtype of the type of the variable. For example, if we types to the above program
One of the sources of false positives in Luau (and many other similar languages like TypeScript or Flow) is *subtyping*. Subtyping is used whenever a variable is initialized or assigned to, and whenever a function is called: the type system checks that the type of the expression is a subtype of the type of the variable. For example, if we add types to the above program
```lua
local x : CFrame = CFrame.new()
local y : Vector3 | CFrame