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since in the tool xml the values can only be specified as str
also the attribute needs to be a str. currently, for instance,
filtering for non-str (e.g. int) metadata values does not work.
for instance this does not worked so far
```
<param ... type="data" format="fasta">
<options options_filter_attribute="metadata.sequences">
<filter type="add_value" value="1"/>
</options>
</param>
```