Extracted from this comment authored by @regis-leray.

Commands

• DISCARD Discard all commands issued after MULTI
• EXEC Execute all commands issued after MULTI
• MULTI Mark the start of a transaction block
• UNWATCH Forget about all watched keys
• WATCH key [key ...] Watch the given keys to determine execution of the MULTI/EXEC block

Tips

• Define the API in zio.redis.api.
• Command-specific options should be defined in zio.redis.options.
• Additional inputs and outputs can be defined in zio.redis.Input and zio.redis.Output, respectively.
• Redis API evolves, therefore the commands listed above might be slightly changed. Double check the official docs before starting with implementation.
• Use telnet to understand command protocol details.
• Write inputs and outputs tests in zio.redis.InputSpec and zio.redis.OutputSpec, respectively.
• Write integration tests by expanding the zio.redis.ApiSpec.
• If you feel that the pull request size is growing out of control, feel free to split it but make sure to link this issue in each of the related PRs.