add wisdom on filters vs md
Checklist
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I have read the contribution guidelines. -
Unit tests have been added for any new or changed code, and the test suite passes. Note: Your request will likely not be merged without the appropriate tests. -
New features and API Changes are described in doc/releasenotes.rst
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"closes #1352 " is in the body of the MR description to link the related issue, if applicable.
Remove assertion and add comment explaining our predicament.