some questions related to sorting in registers

["Vianney le Clément" <vleclement@gmail.com>]

Hello,

There has been some discussion about this lately, but I have some
questions about the sort order in registers. Consider this example:

\starttext
\index{42 numbers}
\index{'apostrophe}
\index{‘apostrophe}
\index{’apostrophe}
\index{"quote}
\index{“quote}
\index{”quote}
\index{Oo}
\index{ob}
\index{oz}
\index{Öa}
Test
\subject{Method zm}
\placeindex[method=zm]
\subject{Method zc}
\placeindex[method=zc]
\stoptext

First of all, common to both methods, I'd like the unicode apostrophes
and quotes to be ignored just like their "straight" counterpart. Is
there a method to do so, apart from specifying the key manually?

Using the zm method, entries beginning with a number appear at the
very bottom of the index, which is quite a strange place especially as
there is no separation with the previous letter. Using the zc method,
the numbers are at the right place, but now entries beginning with an
accented character appear wrongly in a separate group after the
unaccented letters. Is there a way to get the best of both methods?

Thanks,
Vianney
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