bugfix: Classcast for eg arbconst(1)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25759 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
4.9.139.0

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25760 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Fix bad trace to spreadsheet when Sequence[...]

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25761 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e