Re: [editing] How do we switch the caret between overtype and insert mode? (#55)

Agreed we want to avoid a mess that makes implementation harder. But this is basically a user-facing option and it is unclear whether users will be really upset if it disappears. In particular, I don't know what the use cases are beyond "deal with someone pressing the insert button on a 1980s keyboard"…

What about:
1. There is an event for a request to overtype, since there is a use behaviour on lots of systems that does this.
2. Expected behaviour is to say "we don't support that".
3. We note that some people *may* implement something different (such as allowing overtype mode).

And FWIW I believe the "modern style" for APIs is to use strings rather than numerical constants as identifiers for things like events.

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