class ReeMapper::Float

def cast(value, role: nil)
  if value.is_a?(Float)
    value
  elsif value.is_a?(String)
    begin
      Float(value)
    rescue ArgumentError => e
      raise ReeMapper::CoercionError, "is invalid float"
    end
  else
    raise ReeMapper::TypeError, "should be a float"
  end
end

def db_dump(value, role: nil)
  serialize(value, role: role)
end

def db_load(value, role: nil)
  cast(value, role: role)
end

def serialize(value, role: nil)
  if value.is_a?(Float)
    value
  else
    raise ReeMapper::TypeError, 'should be a float'
  end
end