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I figured it would let people comment on the syntax I propose more easily if I extracted it from the patch. Here’s the example:
 package_data =
 cheese = data/templates/* doc/*
 doc/images/*.png
We have a package name, equals sign, then specs/globs separated by whitespace, including newlines (without any indent rules for the continuation lines, the code just adds them to the last seen package name if there is no equals sign in the lign).