What characters can be escaped?

[mtsknn]

Currently the documentation mentions only this regarding escaping:

Escape an annotation with a backslash:

This is an item \[but this is not an annotation]

What other characters can be escaped? Some thoughts:

• For consistency, I think that ] should also be escapable (\]).
• Colons inside annotations could also be escapable to prevent the colon to be interpreted as the end of the annotation type. E.g.:
  • The type of [foo:bar] would be foo and the value would be bar.
  • The type of [foo\:bar] would be foo:bar and there would be no value.
• How about ornamentation? E.g. \- A bullet point.
• \n should likely be interpreted as a newline in the item's value (or annotation's type or value), right? Edit: Or actually, should it be possible to have newlines in an annotation's type or value?
• Any other characters?

Also, how should the escape character be interpreted when it's used in front of non-escapable characters? E.g. should the value of foo \bar be foo bar, foo \\bar or something else? (I don't know if this question makes much sense outside of JavaScript.)

[gamburg]

Great. \[ and \] make a lot of sense, as does escapable ornamentation.

My intuition is that colons being escapable feels very coder-centric -- I can't think of a real-world use case of this for a thinker. I suppose someone might want an annotation of type re:finances or something? But it seems like a stretch, and easily circumventable by just specifying a different type (eg. finances).

Then again, I can't think of a good reason why not to allow colons to be escapable, as maybe power users would find this useful once in a while, and the average user never needs to know about it. Seeing as it probably wouldn't weigh down the spec all that much, it seems ok.

And definitely I think the escape character \ should always be interpreted except when used in front of an escapable character.