gitignore vs. exclude vs assume-unchanged?

From: alex@bellandwhistle.net <alex@bellandwhistle.net>
Date: Apr 16, 2014, 16:33 UTC
Message-ID: <b3f480af1c362c615ad9ce85296e2be2@bellandwhistle.net>

Any clarification on the differences much appreciated:

http://stackoverflow.com/questions/23097368/git-ignore-vs-exclude-vs-assume-unchanged/23097509

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