dylan-lang/opendylan — pull request #769 by waywardmonkeys (2014-06-05 02:44:10+00:00)
Title: [dfmc-modeling] Fix ^known-disjoint? ambiguity with singletons and unions

Without this, you could get the occasional warning:

````
Warning: Method specificity of unorderable methods
{:
{: ??? (<&type>, <&union>)},
{: ??? (<&singleton>, <&type>)}}
applying
{: ^known-disjoint?}
to
{: {<&singleton>}, {<&union>}}
was determined with arbitrary and capricious rules.
````