The HashiCorp team has released two new libraries for Terraform provider development, enabling more powerful interactions with Terraform. The `terraform-plugin-go` module provides a lower-level abstraction of the Terraform protocol, allowing advanced developers to access all of Terraform's functionality at the expense of fewer guardrails and more verbosity. The `terraform-plugin-mux` module allows provider developers to multiplex multiple provider implementations into a single Terraform provider server, enabling easier upgrades between frameworks one resource at a time. Additionally, the Terraform Plugin SDK has been migrated to use `terraform-plugin-go`, making it transparently usable with `terraform-plugin-mux`. These new modules aim to improve the Terraform provider developer experience and enable more aggressive development of enhancements for new resources without breaking existing ones.