/usr/share/tcltk/nsf-xotcl2/serialize/Serializer.xotcl is in nsf 2.0.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | # -*- Tcl -*-
# offer old package name for backward minimal compatibility
package provide xotcl::serializer 2.0
package require nx::serializer
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