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Update read-only-environment.md

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rfcs/read-only-environment.md
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@ -12,16 +12,20 @@ getfenv and setfenv there are outlined cases where reading the environment is us
Increased performance can be achieved for transpilers written in Luau that may not be able to have a static environment created to access functions from or cant directly transpile 1:1. Similarly Increased performance can be achieved for transpilers written in Luau that may not be able to have a static environment created to access functions from or cant directly transpile 1:1. Similarly
interpreters written in Luau can benefit from being able to access functions without deoptimization, making other optimizations still active. interpreters written in Luau can benefit from being able to access functions without deoptimization, making other optimizations still active.
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## Design ## Design
... A safe way to access the environment is with a read-only table with `__index` and `__iter` metamethods.
a) `_ENV` table
A read-only global table with metamethods that point to `LUA_ENVIRONINDEX`.
b) `getenv` or `getrenv` function
Works identically to `getfenv` but only provides read-only access to the function's environment.
## Drawbacks ## Drawbacks
... Type-checking can be difficult.
## Alternatives Roblox's marketplace currently hides assets that use `getfenv` so it would need to be updated to hide assets with `_ENV`/`getenv`/`getrenv`.
...