Currently, $<- on a Symm matrix allows asymetric assignment. That's bad.
This 2-year old issue is the same
http://openmx.psyc.virginia.edu/issue/2014/07/mxmatrixvalues-accessor-not-checking-legality-assignment
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#1
This 2-year old issue is the same
http://openmx.psyc.virginia.edu/issue/2014/07/mxmatrixvalues-accessor-not-checking-legality-assignment