[SQLObject] MultipleJoin does not respect specified keys

[<jws...@ra...>]

Given the following classes, when I call 'shiptos' on an instance of my
CustAccount class, I see that the resulting SQL looks like 'SELECT shipto_id
FROM shiptos WHERE cust_accounts_id = 2'. It is apparently attempting to
guess what the primary key is based on the Style, even though I specified
the column name by hand. This is just a bit beyond my ability to fix at the
moment.

class CustAccount(SQLObject):
	_table = "cust_accounts"
	_idName = "cust_id"
	name = StringCol()
	shiptos = MultipleJoin('Shipto')

class Shipto(SQLObject):
	_table = "shiptos"
	_idName = "shipto_id"
	name = StringCol()
	cust = ForeignKey('CustAccount')