EntityFramework6.Npgsql
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Cast null string parameters to varchar Fixes npgsql/EntityFramework6.Npgsql#121
Maybe cast to text instead of varchar? (Don't really know what difference it makes though...)
I took varchar from the fix for the similar issue #27 as an example: https://github.com/npgsql/EntityFramework6.Npgsql/commit/e1689b94b8b83e94023f5bfb751b6345349d550c#diff-e299df15cc3fa1e8f0a2b9ea9fa5ac80