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Following simple patch allows pinning by codename.
man apt_preferences:
the Codename: line
names the codename to which all the packages in the directory tree
belong. For example, the line "Codename: wheezy" specifies that all
of the packages in the directory tree below the parent of the
Release file belong to a version named wheezy. Specifying this
value in the APT preferences file would require the line: