Adds TOrderedSet.isValid().
Adds TOrderedSet.isValid().

haiodo/Nim,SSPkrolik/Nim,gokr/Nim,zachaysan/Nim,dom96/Nim,zachaysan/Nim,greyanubis/Nim,fredericksilva/Nim,jfhg/Nim,judofyr/Nim,nimLuckyBull/Nim,judofyr/Nim,singularperturbation/Nim,Dhertz/Nim,mbaulch/Nim,fmamud/Nim,reactormonk/nim,fmamud/Nim,tulayang/Nim,nanoant/Nim,douglas-larocca/Nim,dom96/Nim,SSPkrolik/Nim,sarvex/Nim-lang,xland/Nim,Matt14916/Nim,dom96/Nim,zachaysan/Nim,tmm1/Nim,reactormonk/nim,tulayang/Nim,msmith491/Nim,Salafit/Nim,sarvex/Nim-lang,MrJohz/Nim,kirbyfan64/Nim,kirbyfan64/Nim,kirbyfan64/Nim,jsanjuas/Nim,judofyr/Nim,greyanubis/Nim,jsanjuas/Nim,reactormonk/nim,jsanjuas/Nim,Senketsu/Nim,fredericksilva/Nim,haiodo/Nim,fredericksilva/Nim,msmith491/Nim,douglas-larocca/Nim,douglas-larocca/Nim,Matt14916/Nim,sferik/Nim,Matt14916/Nim,Dhertz/Nim,tulayang/Nim,JCavallo/Nim,MrJohz/Nim,Senketsu/Nim,fmamud/Nim,endragor/Nim,endragor/Nim,nanoant/Nim,gokr/Nim,zachaysan/Nim,Senketsu/Nim,gokr/Nim,nanoant/Nim,nafsaka/Nim,SSPkrolik/Nim,nafsaka/Nim,mbaulch/Nim,Salafit/Nim,BlaXpirit/nim,haiodo/Nim,nanoant/Nim,haiodo/Nim,reactormonk/nim,sarvex/Nim-lang,jsanjuas/Nim,Salafit/Nim,bvssvni/Nim,russpowers/Nim,BlaXpirit/nim,tmm1/Nim,kirbyfan64/Nim,tmm1/Nim,kirbyfan64/Nim,fredericksilva/Nim,judofyr/Nim,SSPkrolik/Nim,MrJohz/Nim,jfhg/Nim,endragor/Nim,haiodo/Nim,JCavallo/Nim,jfhg/Nim,Matt14916/Nim,msmith491/Nim,jsanjuas/Nim,reactormonk/nim,judofyr/Nim,russpowers/Nim,Dhertz/Nim,mbaulch/Nim,nimLuckyBull/Nim,fredericksilva/Nim,BlaXpirit/nim,gokr/Nim,singularperturbation/Nim,douglas-larocca/Nim,greyanubis/Nim,douglas-larocca/Nim,SSPkrolik/Nim,Salafit/Nim,tulayang/Nim,nimLuckyBull/Nim,singularperturbation/Nim,msmith491/Nim,nafsaka/Nim,xland/Nim,nimLuckyBull/Nim,JCavallo/Nim,msmith491/Nim,russpowers/Nim,BlaXpirit/nim,nafsaka/Nim,xland/Nim,SSPkrolik/Nim,dom96/Nim,douglas-larocca/Nim,mbaulch/Nim,sarvex/Nim-lang,sferik/Nim,MrJohz/Nim,endragor/Nim,msmith491/Nim,Matt14916/Nim,JCavallo/Nim,gokr/Nim,endragor/Nim,mbaulch/Nim,Salafit/Nim,zachaysan/Nim,JCavallo/Nim,tmm1/Nim,nanoant/Nim,fredericksilva/Nim,tmm1/Nim,jsanjuas/Nim,nafsaka/Nim,Senketsu/Nim,sferik/Nim,gokr/Nim,nimLuckyBull/Nim,bvssvni/Nim,Senketsu/Nim,dom96/Nim,sferik/Nim,russpowers/Nim,reactormonk/nim,mbaulch/Nim,BlaXpirit/nim,jfhg/Nim,bvssvni/Nim,xland/Nim,judofyr/Nim,douglas-larocca/Nim,xland/Nim,fmamud/Nim,dom96/Nim,reactormonk/nim,judofyr/Nim,russpowers/Nim,Senketsu/Nim,JCavallo/Nim,BlaXpirit/nim,JCavallo/Nim,judofyr/Nim,Salafit/Nim,tulayang/Nim,kirbyfan64/Nim,douglas-larocca/Nim,fmamud/Nim,endragor/Nim,MrJohz/Nim,SSPkrolik/Nim,sferik/Nim,Matt14916/Nim,singularperturbation/Nim,kirbyfan64/Nim,Dhertz/Nim,singularperturbation/Nim,tulayang/Nim,Dhertz/Nim,greyanubis/Nim,singularperturbation/Nim,singularperturbation/Nim,greyanubis/Nim,zachaysan/Nim,fredericksilva/Nim,tmm1/Nim,sferik/Nim,greyanubis/Nim,gokr/Nim,SSPkrolik/Nim,sarvex/Nim-lang,Matt14916/Nim,Salafit/Nim,bvssvni/Nim,bvssvni/Nim,xland/Nim,Dhertz/Nim,jfhg/Nim,tmm1/Nim,Senketsu/Nim,sarvex/Nim-lang,fmamud/Nim,xland/Nim,dom96/Nim,jfhg/Nim,mbaulch/Nim,BlaXpirit/nim,Dhertz/Nim,MrJohz/Nim,msmith491/Nim,russpowers/Nim,gokr/Nim,nafsaka/Nim,sarvex/Nim-lang,zachaysan/Nim,bvssvni/Nim,jsanjuas/Nim,fmamud/Nim,endragor/Nim,nimLuckyBull/Nim,greyanubis/Nim,BlaXpirit/nim,fredericksilva/Nim,MrJohz/Nim,bvssvni/Nim,sferik/Nim,reactormonk/nim,nimLuckyBull/Nim,russpowers/Nim,jfhg/Nim,sferik/Nim,nanoant/Nim,nafsaka/Nim,nanoant/Nim,kirbyfan64/Nim,haiodo/Nim,haiodo/Nim