When creating tests for the namespace-uri() function, I somehow managed to trigger an error condition that caused this exception:

[error] Test edu.illinois.ncsa.daffodil.section23.dfdl_expressions.TestDFDLExpressions.test_namespace_uri_01 failed: edu.illinois.ncsa.daffodil.exceptions.Abort: why are you comparing two things that aren't the same type even?
[error] edu.illinois.ncsa.daffodil.exceptions.Assert$.abort(Assert.scala:95)

I had this test working at one point so I'm not sure how I got to this state. I was amused by the exception but figured we should either revisit the wording or figure out how it was triggered and make sure that can't happen anymore.

See test namespace_uri_01 in the following files:
daffodil-test/src/test/resources/edu/illinois/ncsa/daffodil/section23/dfdl_functions/Functions.tdml
daffodil-test/src/test/resources/edu/illinois/ncsa/daffodil/section23/dfdl_functions/first_schema.dfdl.xsd
daffodil-test/src/test/resources/edu/illinois/ncsa/daffodil/section23/dfdl_functions/home_schema.dfdl.xsd
daffodil-test/src/test/resources/edu/illinois/ncsa/daffodil/section23/dfdl_functions/second_schema.dfdl.xsd
daffodil-test/src/test/scala-debug/edu/illinois/ncsa/daffodil/section23/dfdl_expressions/TestDFDLExpressionsDebug.scala
daffodil-test/src/test/scala/edu/illinois/ncsa/daffodil/section23/dfdl_expressions/TestDFDLExpressions.scala