Double alias no longer works

[matthewmcgarvey]

This seems to not working anymore with lucky 0.26

alias Double = Float64
class Agency < BaseModel
    column latitude : Double?
    column longitude : Double?
end

The error:

PG::ResultSet#read returned a Float64. A (PG::Numeric | Nil) was expected.

I see here 8bf9a1f#diff-7388ecacebfb91d79a5f8b87e42556bdbc805add6ebe0c5005ad7b180ba8efddR7 an update of the ColumnType

Originally posted by @brunto in #200 (comment)

[brunto]

I think simply update the ColumnType should work: alias ColumnType = Float64 | ::PG::Numeric

[matthewmcgarvey]

Completed by #637