R. David Murray <rdmur...@bitdance.com> added the comment:

Leaving the input unchanged does seem to be what browsers do.  (Issue 7626 has 
some info on browser behaviour with invalid entity refs.)

Rather than pre-validating the input, I think the exception can be caught and 
the putative entity returned unchanged, similar to how a keyerror is handled 
for a named entity.

Would you have any interest in proposing a patch and tests?

----------
nosy: +orsenthil, r.david.murray
stage:  -> needs patch

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