Broken get_account_history call

It fails when 'start' parameter is passed as a string, which can be converted into integer number:

{
	"jsonrpc": "2.0",
	"id": "2",
	"method": "account_history_api.get_account_history",
	"params": {
		"account": "initminer",
		"start": "1000",
		"limit": 1000
	}
}

{
  "error": {
    "code": -32000,
    "data": "TypeError: '>=' not supported between instances of 'str' and 'int'",
    "message": "Server error"
  },
  "id": "2",
  "jsonrpc": "2.0"
}