Highlights:

- The internal implementation of pipes has been overhauled; this should result in improved performance. Addresses: https://cygwin.com/pipermail/cygwin/2021-August/249238.html(link is external)

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IMPORTANT DEPRECATION NOTES
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- Cygwin 3.3.0 is the LAST major version supporting

- Windows Vista
- Windows Server 2008

- Cygwin 3.3.0 is the LAST major version supporting 32 bit installations.