Wrong non-schema Enum mapping

[kemocca]

When enum of non-int type used in query, it loose bitwise operations, so enum_value.HasFlag(other_value) can't be executed in PostgreSQL, since value mapped to numeric.

Example enum:

[Flags]
enum UsageFlags : long
{
    None = 0,
    VariantA = 1,
    VariantB = 2,
    VariantC = 4,
}

Example query:

var first = from something in somethingDbSet
            where something.Mark == usedMark
            select new
            {
                something.Value,
                Flags = UsageFlags.VariantA | UsageFlags.VariantB
            };

var second = from value in first
             where value.Flags.HasFlag(Usage.VariantB)
             select value.Value

Chunk with translated SQL: WHERE u."Flags" & 2.0 = 2.0

Npgsql version: 10.0.3