It's ugly, but it is very fast indeed. Keep in mind that this version does '''not''' strip leading spaces from the list items.
If you need to present a comma separated list of values (like an author list, for example) in a single line, with the option of changing the separator of the items and have a distinct separator for the last item of the list, you can use {{cmd|commalistsentence}}.
<texcode>
\commalistsentence[a,b,c]
\commalistsentence[a,b,c][{ \& },{ and }]
\commalistsentence[a,b,c][+,-]
</texcode>
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