cast_value

# File activemodel/lib/active_model/type/decimal.rb, line 20
        def cast_value(value)
          casted_value =              case value
            when ::Float
              convert_float_to_big_decimal(value)
            when ::Numeric
              BigDecimal(value, precision || BIGDECIMAL_PRECISION)
            when ::String
              begin
                value.to_d
              rescue ArgumentError
                BigDecimal(0)
              end
            else
              if value.respond_to?(:to_d)
                value.to_d
              else
                cast_value(value.to_s)
              end
            end

          apply_scale(casted_value)
        end