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Update library.md (#352)

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Clarify the relationship between `typeof` and `newproxy`. As a sandboxing measure, `typeof` only uses `__type` on host-defined userdata.

Fixes #351.
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Arseny Kapoulkine 2022-02-09 09:19:50 -08:00 • committed by GitHub
parent 041838a942
commit ec481695a3
Signed by: DevComp
GPG key ID: 4AEE18F83AFDEB23
1 changed files with 2 additions and 1 deletions
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docs/_pages/library.md
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@ -128,7 +128,8 @@ Returns the type of the object, which is one of `"nil"`, `"boolean"`, `"number"`
function typeof(obj: any): string
```
Returns the type of the object; for userdata objects that have a metatable with the `__type` field, returns the value for that key.
Returns the type of the object; for userdata objects that have a metatable with the `__type` field *and* are defined by the host with an internal tag, returns the value for that key.
For custom userdata objects, such as ones returned by `newproxy`, this function returns `"userdata"` to make sure host-defined types can not be spoofed.
```
function ipairs(t: table): <iterator>