Wed, 03 Oct 2012 16:42:36 +0200 wenzelm use explicit Type.strip_sorts_dummy to suppress sort constraints in output;
Wed, 03 Oct 2012 16:01:07 +0200 wenzelm printed "_ofsort" is subject to show_markup as well;
Wed, 03 Oct 2012 14:58:56 +0200 wenzelm allow position constraints to coexist with 0 or 1 sort constraints;
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