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Transforms for PEP processing.
- `Headers`: Used to transform a PEP's initial RFC-2822 header. It remains a
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- `Contents`: Auto-inserts a table of contents.
- `PEPZero`: Special processing for PEP 0.
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Process fields in a PEP's initial RFC-2822 header.
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Insert an empty table of contents topic and a transform placeholder into
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Remove an empty "References" section.
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Perform the special processing needed by PEP 0:
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themselves.
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Mask the email address in `ref` and return a replacement node.
`ref` is returned unchanged if it contains no email address.
For email addresses such as "user@host", mask the address as "user at
host" (text) to thwart simple email address harvesters (except for those
listed in `non_masked_addresses`). If a PEP number (`pepno`) is given,
return a reference including a default email subject.
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