UnIndex applies its `_convert` method on searching but not on indexing
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andbag commented
There is another suboptimal thing with UnIndex:
it applies its _convert method on searching but not on indexing.
In general, it is adviceable to process the values for indexing
in the same way as those for searching - otherwise, there is
a risk that searches give surprising results.
The _convert of UnIndex is the identity. Thus, we do not see
a true error. However, if UnIndex would employ _convert homogenously
(both during indexing as well as during searching), then (e.g.)
DateIndex could define its own _convert
and use everything else from UnIndex/FieldIndex.
Originally posted by @d-maurer in #64 (comment)