## 1.6.0 (Unreleased)

ENHANCEMENTS:
* config: Terraform can now track some additional detail about values that won't be known until the apply step, such as the range of possible lengths for a collection or whether an unknown value can possibly be null. When this information is available, Terraform can potentially generate known results for some operations on unknown values. This doesn't mean that Terraform can immediately track that detail in all cases, but the type system now contains the facility for that and so over time we will improve the level of detail generated by built-in functions, language operators, Terraform providers, etc. [GH-33234]

## Previous Releases

For information on prior major and minor releases, see their changelogs:

* [v1.5](https://github.com/hashicorp/terraform/blob/v1.5/CHANGELOG.md)
* [v1.4](https://github.com/hashicorp/terraform/blob/v1.4/CHANGELOG.md)
* [v1.3](https://github.com/hashicorp/terraform/blob/v1.3/CHANGELOG.md)
* [v1.2](https://github.com/hashicorp/terraform/blob/v1.2/CHANGELOG.md)
* [v1.1](https://github.com/hashicorp/terraform/blob/v1.1/CHANGELOG.md)
* [v1.0](https://github.com/hashicorp/terraform/blob/v1.0/CHANGELOG.md)
* [v0.15](https://github.com/hashicorp/terraform/blob/v0.15/CHANGELOG.md)
* [v0.14](https://github.com/hashicorp/terraform/blob/v0.14/CHANGELOG.md)
* [v0.13](https://github.com/hashicorp/terraform/blob/v0.13/CHANGELOG.md)
* [v0.12](https://github.com/hashicorp/terraform/blob/v0.12/CHANGELOG.md)
* [v0.11 and earlier](https://github.com/hashicorp/terraform/blob/v0.11/CHANGELOG.md)