* Delete all existing fields when fieldName is `*`
* Rearrange deletion before addition in headers
* Revert "Rearrange deletion before addition in headers"
This reverts commit 1b50eeeccc92ccd660c7896d8283c7d9e5d1fcb0.
* Treat deleting all headers as a special case
* Apply suggestions from code review
Co-authored-by: Matt Holt <mholt@users.noreply.github.com>
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Co-authored-by: Matt Holt <mholt@users.noreply.github.com>