This document tracks unimplemented RFCs. ## Deprecate getfenv/setfenv [RFC: Deprecate getfenv/setfenv](https://github.com/Roblox/luau/blob/master/rfcs/deprecate-getfenv-setfenv.md) **Status**: Needs implementation. **Notes**: Implementing this RFC triggers warnings across the board in the apps ecosystem, in particular in testing libraries. Pending code changes / decisions. ## Read-only and write-only properties [RFC: Read-only properties](https://github.com/Roblox/luau/blob/master/rfcs/property-readonly.md) | [RFC: Write-only properties](https://github.com/Roblox/luau/blob/master/rfcs/property-writeonly.md) **Status**: Needs implementation ## Sealed/unsealed typing changes [RFC: Unsealed table literals](https://github.com/Roblox/luau/blob/master/rfcs/unsealed-table-literals.md) | [RFC: Only strip optional properties from unsealed tables during subtyping](https://github.com/Roblox/luau/blob/master/rfcs/unsealed-table-subtyping-strips-optional-properties.md) **Status**: Implemented but not fully rolled out yet. ## Singleton types [RFC: Singleton types](https://github.com/Roblox/luau/blob/master/rfcs/syntax-singleton-types.md) **Status**: Implemented but not fully rolled out yet. ## Safe navigation operator [RFC: Safe navigation postfix operator (?)](https://github.com/Roblox/luau/blob/master/rfcs/syntax-safe-navigation-operator.md) **Status**: Needs implementation. **Notes**: We have unresolved issues with interaction between this feature and Roblox instance hierarchy. This may affect the viability of this proposal. ## String interpolation [RFC: String interpolation](https://github.com/Roblox/luau/blob/master/rfcs/syntax-string-interpolation.md) **Status**: Needs implementation ## Generalized iteration [RFC: Generalized iteration](https://github.com/Roblox/luau/blob/master/rfcs/generalized-iteration.md) **Status**: Needs implementation