Flow with 'Checked' prior value

<?xml version="1.0" encoding="UTF-8"?>
<Flow xmlns="http://soap.sforce.com/2006/04/metadata">
    <actionCalls>
        <processMetadataValues>
            <name>postTarget</name>
            <value>
                <stringValue>User User</stringValue>
            </value>
        </processMetadataValues>
        <processMetadataValues>
            <name>postTargetUserType</name>
            <value>
                <stringValue>USER</stringValue>
            </value>
        </processMetadataValues>
        <processMetadataValues>
            <name>textJson</name>
            <value>
                <stringValue>{&quot;mentions&quot;:[],&quot;message&quot;:&quot;Message Body&quot;}</stringValue>
            </value>
        </processMetadataValues>
        <name>myRule_1_A1</name>
        <label>Post to Chatter</label>
        <locationX>100</locationX>
        <locationY>200</locationY>
        <actionName>chatterPost</actionName>
        <actionType>chatterPost</actionType>
        <inputParameters>
            <name>text</name>
            <value>
                <stringValue>Message Body</stringValue>
            </value>
        </inputParameters>
        <inputParameters>
            <name>type</name>
            <value>
                <stringValue>USER</stringValue>
            </value>
        </inputParameters>
        <inputParameters>
            <name>subjectNameOrId</name>
            <value>
                <stringValue>0052D000004eFtDQAU</stringValue>
            </value>
        </inputParameters>
    </actionCalls>
    <decisions>
        <processMetadataValues>
            <name>index</name>
            <value>
                <numberValue>0.0</numberValue>
            </value>
        </processMetadataValues>
        <name>myDecision</name>
        <label>myDecision</label>
        <locationX>50</locationX>
        <locationY>0</locationY>
        <defaultConnector>
            <targetReference>myDecision2</targetReference>
        </defaultConnector>
        <defaultConnectorLabel>default</defaultConnectorLabel>
        <rules>
            <name>myRule_1</name>
            <conditionLogic>and</conditionLogic>
            <conditions>
                <processMetadataValues>
                    <name>inputDataType</name>
                    <value>
                        <stringValue>Picklist</stringValue>
                    </value>
                </processMetadataValues>
                <processMetadataValues>
                    <name>leftHandSideType</name>
                    <value>
                        <stringValue>Picklist</stringValue>
                    </value>
                </processMetadataValues>
                <processMetadataValues>
                    <name>operatorDataType</name>
                    <value>
                        <stringValue>String</stringValue>
                    </value>
                </processMetadataValues>
                <processMetadataValues>
                    <name>rightHandSideType</name>
                    <value>
                        <stringValue>Picklist</stringValue>
                    </value>
                </processMetadataValues>
                <leftValueReference>myVariable_current.Rating</leftValueReference>
                <operator>EqualTo</operator>
                <rightValue>
                    <stringValue>Hot</stringValue>
                </rightValue>
            </conditions>
            <connector>
                <targetReference>myRule_1_pmetdec</targetReference>
            </connector>
            <label>1st Decision Diamond</label>
        </rules>
    </decisions>
    <decisions>
        <processMetadataValues>
            <name>index</name>
            <value>
                <numberValue>1.0</numberValue>
            </value>
        </processMetadataValues>
        <name>myDecision2</name>
        <label>myDecision2</label>
        <locationX>50</locationX>
        <locationY>0</locationY>
        <defaultConnectorLabel>default</defaultConnectorLabel>
        <rules>
            <name>myRule_3</name>
            <conditionLogic>and</conditionLogic>
            <conditions>
                <leftValueReference>formula_myRule_3</leftValueReference>
                <operator>EqualTo</operator>
                <rightValue>
                    <booleanValue>true</booleanValue>
                </rightValue>
            </conditions>
            <label>2nd Decision Diamond</label>
        </rules>
    </decisions>
    <decisions>
        <name>myRule_1_pmetdec</name>
        <label>Previously Met Decision</label>
        <locationX>100</locationX>
        <locationY>100</locationY>
        <defaultConnector>
            <targetReference>myRule_1_A1</targetReference>
        </defaultConnector>
        <defaultConnectorLabel>Not Previously Met</defaultConnectorLabel>
        <rules>
            <name>myRule_1_pmetnullrule</name>
            <conditionLogic>or</conditionLogic>
            <conditions>
                <leftValueReference>myVariable_old</leftValueReference>
                <operator>IsNull</operator>
                <rightValue>
                    <booleanValue>true</booleanValue>
                </rightValue>
            </conditions>
            <connector>
                <targetReference>myRule_1_A1</targetReference>
            </connector>
            <label>Previously Met - Null</label>
        </rules>
        <rules>
            <name>myRule_1_pmetrule</name>
            <conditionLogic>and</conditionLogic>
            <conditions>
                <processMetadataValues>
                    <name>inputDataType</name>
                    <value>
                        <stringValue>Picklist</stringValue>
                    </value>
                </processMetadataValues>
                <processMetadataValues>
                    <name>leftHandSideType</name>
                    <value>
                        <stringValue>Picklist</stringValue>
                    </value>
                </processMetadataValues>
                <processMetadataValues>
                    <name>operatorDataType</name>
                    <value>
                        <stringValue>String</stringValue>
                    </value>
                </processMetadataValues>
                <processMetadataValues>
                    <name>rightHandSideType</name>
                    <value>
                        <stringValue>Picklist</stringValue>
                    </value>
                </processMetadataValues>
                <leftValueReference>myVariable_old.Rating</leftValueReference>
                <operator>EqualTo</operator>
                <rightValue>
                    <stringValue>Hot</stringValue>
                </rightValue>
            </conditions>
            <label>Previously Met - Prev</label>
        </rules>
    </decisions>
    <formulas>
        <name>formula_myRule_3</name>
        <dataType>Boolean</dataType>
        <expression>true</expression>
    </formulas>
    <interviewLabel>DemoProcess_Story_2_1-1_InterviewLabel</interviewLabel>
    <label>DemoProcess-Story 2.1</label>
    <processMetadataValues>
        <name>ObjectType</name>
        <value>
            <stringValue>Account</stringValue>
        </value>
    </processMetadataValues>
    <processMetadataValues>
        <name>ObjectVariable</name>
        <value>
            <elementReference>myVariable_current</elementReference>
        </value>
    </processMetadataValues>
    <processMetadataValues>
        <name>OldObjectVariable</name>
        <value>
            <elementReference>myVariable_old</elementReference>
        </value>
    </processMetadataValues>
    <processMetadataValues>
        <name>TriggerType</name>
        <value>
            <stringValue>onAllChanges</stringValue>
        </value>
    </processMetadataValues>
    <processType>Workflow</processType>
    <startElementReference>myDecision</startElementReference>
    <status>Draft</status>
    <variables>
        <name>myVariable_current</name>
        <dataType>SObject</dataType>
        <isCollection>false</isCollection>
        <isInput>true</isInput>
        <isOutput>true</isOutput>
        <objectType>Account</objectType>
    </variables>
    <variables>
        <name>myVariable_old</name>
        <dataType>SObject</dataType>
        <isCollection>false</isCollection>
        <isInput>true</isInput>
        <isOutput>false</isOutput>
        <objectType>Account</objectType>
    </variables>
</Flow>