Motivation
Currently, the default is 4 spaces for map values and 2 spaces for sequence items.

Summary of desired enhancement
We should move to 2 spaces for both. Besides making the indentation scheme simpler for a user, I have also noticed the following compatibility enhancements:

• LLM code completion (e.g. GitHub Copilot) seems to be design to use consistent indentation and doesn't cope well with the current approach
• VS Code automatically detects indentation and applies a formatter (at least with my config) but it is not coping with the mixed indentation approach.