1.3.13
Add support for extracting characters with a custom function.
1.3.12
Add derived Typeable and Data instances for the XML types.
1.3.11
Don't automatically escape all non-ASCII characters.
This looses a bit of generality in that we are producing a unicode
string, that can't really be turned uinto ASCII form. On the other hand,
it is not clear that there is much use to support this, while
non-ASCII characters are quite common in modern usage, and it is not
nice if you have to look at them in encoded form.
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