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Add section on constant shadowing

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Dekkonot 2021-11-11 13:03:29 -08:00
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rfcs/syntax-constant-variables.md
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@ -41,6 +41,8 @@ const foo = 1
foo = 5 -- error here foo = 5 -- error here
``` ```
Shadowing a constant would not be supported because it goes against the idea of a constant and variable shadowing is widely considered to be a mistake when it occurs (Luau has a lint against doing this). This is inconsistent with how normal variables function, but mistakes should not be repeated just for the sake of consistency.
--- ---
There would be no type restrictions for what could be set as a constant. Given that tables and userdata **must** be allowed as constants for them to be useful, there isn't much of a point in restricting what types can be set as a constant. Userdata must be allowed because almost every useful datatype in Roblox is a userdata under the hood, and it should be possible to set them as a constant. Tables must be allowed for a very similar reason, as they're a basic part of Luau and a significant amount of user code uses them for custom datatypes. There would be no type restrictions for what could be set as a constant. Given that tables and userdata **must** be allowed as constants for them to be useful, there isn't much of a point in restricting what types can be set as a constant. Userdata must be allowed because almost every useful datatype in Roblox is a userdata under the hood, and it should be possible to set them as a constant. Tables must be allowed for a very similar reason, as they're a basic part of Luau and a significant amount of user code uses them for custom datatypes.