[stdlib] explanatory comment
[stdlib] explanatory comment

Swift SVN r22441

KrishMunot/swift,uasys/swift,MukeshKumarS/Swift,manavgabhawala/swift,roambotics/swift,gribozavr/swift,xedin/swift,tinysun212/swift-windows,KrishMunot/swift,sschiau/swift,dduan/swift,aschwaighofer/swift,jtbandes/swift,gmilos/swift,shajrawi/swift,kperryua/swift,jtbandes/swift,hooman/swift,emilstahl/swift,danielmartin/swift,kusl/swift,manavgabhawala/swift,shahmishal/swift,alblue/swift,CodaFi/swift,bitjammer/swift,alblue/swift,rudkx/swift,allevato/swift,xedin/swift,IngmarStein/swift,glessard/swift,manavgabhawala/swift,rudkx/swift,LeoShimonaka/swift,jckarter/swift,tinysun212/swift-windows,airspeedswift/swift,tardieu/swift,roambotics/swift,return/swift,Ivacker/swift,djwbrown/swift,parkera/swift,airspeedswift/swift,Ivacker/swift,shajrawi/swift,zisko/swift,tardieu/swift,LeoShimonaka/swift,johnno1962d/swift,deyton/swift,sdulal/swift,sschiau/swift,jtbandes/swift,Jnosh/swift,ahoppen/swift,JGiola/swift,Jnosh/swift,parkera/swift,mightydeveloper/swift,swiftix/swift.old,deyton/swift,cbrentharris/swift,stephentyrone/swift,CodaFi/swift,manavgabhawala/swift,jopamer/swift,austinzheng/swift,atrick/swift,brentdax/swift,harlanhaskins/swift,JGiola/swift,khizkhiz/swift,airspeedswift/swift,ben-ng/swift,cbrentharris/swift,gottesmm/swift,kstaring/swift,ahoppen/swift,roambotics/swift,hooman/swift,jckarter/swift,shajrawi/swift,natecook1000/swift,modocache/swift,practicalswift/swift,modocache/swift,OscarSwanros/swift,karwa/swift,CodaFi/swift,stephentyrone/swift,CodaFi/swift,practicalswift/swift,russbishop/swift,danielmartin/swift,jopamer/swift,amraboelela/swift,jtbandes/swift,huonw/swift,harlanhaskins/swift,frootloops/swift,Jnosh/swift,gmilos/swift,atrick/swift,aschwaighofer/swift,jmgc/swift,zisko/swift,huonw/swift,kentya6/swift,frootloops/swift,LeoShimonaka/swift,JaSpa/swift,zisko/swift,swiftix/swift.old,jmgc/swift,MukeshKumarS/Swift,deyton/swift,JaSpa/swift,johnno1962d/swift,kstaring/swift,kperryua/swift,codestergit/swift,tardieu/swift,jtbandes/swift,KrishMunot/swift,aschwaighofer/swift,tkremenek/swift,bitjammer/swift,tardieu/swift,austinzheng/swift,tjw/swift,tkremenek/swift,jckarter/swift,modocache/swift,rudkx/swift,parkera/swift,khizkhiz/swift,ken0nek/swift,gregomni/swift,gottesmm/swift,return/swift,jmgc/swift,sdulal/swift,tkremenek/swift,lorentey/swift,djwbrown/swift,sdulal/swift,adrfer/swift,gregomni/swift,stephentyrone/swift,nathawes/swift,jckarter/swift,adrfer/swift,amraboelela/swift,apple/swift,parkera/swift,swiftix/swift.old,brentdax/swift,Jnosh/swift,frootloops/swift,manavgabhawala/swift,brentdax/swift,natecook1000/swift,uasys/swift,uasys/swift,rudkx/swift,gregomni/swift,codestergit/swift,ahoppen/swift,mightydeveloper/swift,jtbandes/swift,stephentyrone/swift,practicalswift/swift,CodaFi/swift,emilstahl/swift,lorentey/swift,slavapestov/swift,shajrawi/swift,xedin/swift,xedin/swift,LeoShimonaka/swift,ahoppen/swift,khizkhiz/swift,swiftix/swift.old,natecook1000/swift,austinzheng/swift,Ivacker/swift,gribozavr/swift,MukeshKumarS/Swift,natecook1000/swift,emilstahl/swift,kusl/swift,gregomni/swift,OscarSwanros/swift,arvedviehweger/swift,codestergit/swift,cbrentharris/swift,benlangmuir/swift,SwiftAndroid/swift,karwa/swift,parkera/swift,return/swift,LeoShimonaka/swift,cbrentharris/swift,IngmarStein/swift,uasys/swift,calebd/swift,kentya6/swift,atrick/swift,zisko/swift,rudkx/swift,adrfer/swift,brentdax/swift,emilstahl/swift,devincoughlin/swift,deyton/swift,xwu/swift,xedin/swift,nathawes/swift,jopamer/swift,danielmartin/swift,felix91gr/swift,slavapestov/swift,djwbrown/swift,devincoughlin/swift,modocache/swift,karwa/swift,khizkhiz/swift,sschiau/swift,MukeshKumarS/Swift,Ivacker/swift,ben-ng/swift,therealbnut/swift,glessard/swift,deyton/swift,dduan/swift,shajrawi/swift,swiftix/swift.old,gmilos/swift,felix91gr/swift,felix91gr/swift,manavgabhawala/swift,zisko/swift,return/swift,arvedviehweger/swift,aschwaighofer/swift,ken0nek/swift,kusl/swift,amraboelela/swift,roambotics/swift,milseman/swift,devincoughlin/swift,amraboelela/swift,Ivacker/swift,KrishMunot/swift,felix91gr/swift,devincoughlin/swift,alblue/swift,Ivacker/swift,OscarSwanros/swift,harlanhaskins/swift,kusl/swift,swiftix/swift,KrishMunot/swift,swiftix/swift,shahmishal/swift,slavapestov/swift,johnno1962d/swift,sdulal/swift,gmilos/swift,aschwaighofer/swift,hughbe/swift,tkremenek/swift,roambotics/swift,bitjammer/swift,hooman/swift,alblue/swift,uasys/swift,nathawes/swift,KrishMunot/swift,JaSpa/swift,emilstahl/swift,brentdax/swift,shajrawi/swift,sdulal/swift,gmilos/swift,OscarSwanros/swift,therealbnut/swift,milseman/swift,glessard/swift,dreamsxin/swift,IngmarStein/swift,apple/swift,airspeedswift/swift,karwa/swift,Jnosh/swift,gribozavr/swift,modocache/swift,zisko/swift,JaSpa/swift,kusl/swift,parkera/swift,SwiftAndroid/swift,parkera/swift,gmilos/swift,practicalswift/swift,jckarter/swift,gottesmm/swift,gottesmm/swift,tinysun212/swift-windows,dduan/swift,apple/swift,swiftix/swift,kentya6/swift,karwa/swift,harlanhaskins/swift,russbishop/swift,airspeedswift/swift,milseman/swift,swiftix/swift,shahmishal/swift,djwbrown/swift,frootloops/swift,jopamer/swift,gribozavr/swift,LeoShimonaka/swift,huonw/swift,alblue/swift,shahmishal/swift,kstaring/swift,glessard/swift,harlanhaskins/swift,kentya6/swift,johnno1962d/swift,practicalswift/swift,apple/swift,jopamer/swift,therealbnut/swift,gribozavr/swift,Jnosh/swift,allevato/swift,cbrentharris/swift,sdulal/swift,amraboelela/swift,shajrawi/swift,nathawes/swift,airspeedswift/swift,kstaring/swift,shahmishal/swift,tardieu/swift,Ivacker/swift,russbishop/swift,hughbe/swift,benlangmuir/swift,dreamsxin/swift,manavgabhawala/swift,arvedviehweger/swift,hooman/swift,djwbrown/swift,parkera/swift,hughbe/swift,hughbe/swift,shahmishal/swift,stephentyrone/swift,shajrawi/swift,tjw/swift,djwbrown/swift,JaSpa/swift,johnno1962d/swift,JaSpa/swift,sschiau/swift,cbrentharris/swift,return/swift,swiftix/swift.old,lorentey/swift,gottesmm/swift,kentya6/swift,sschiau/swift,lorentey/swift,apple/swift,LeoShimonaka/swift,dduan/swift,adrfer/swift,MukeshKumarS/Swift,SwiftAndroid/swift,ahoppen/swift,mightydeveloper/swift,ben-ng/swift,milseman/swift,ben-ng/swift,huonw/swift,therealbnut/swift,dduan/swift,jmgc/swift,hooman/swift,frootloops/swift,amraboelela/swift,airspeedswift/swift,ken0nek/swift,gribozavr/swift,roambotics/swift,khizkhiz/swift,codestergit/swift,hughbe/swift,khizkhiz/swift,bitjammer/swift,benlangmuir/swift,practicalswift/swift,kstaring/swift,brentdax/swift,Jnosh/swift,ben-ng/swift,devincoughlin/swift,IngmarStein/swift,dduan/swift,sdulal/swift,brentdax/swift,hooman/swift,huonw/swift,tjw/swift,practicalswift/swift,jopamer/swift,austinzheng/swift,harlanhaskins/swift,adrfer/swift,nathawes/swift,arvedviehweger/swift,therealbnut/swift,stephentyrone/swift,sschiau/swift,codestergit/swift,jmgc/swift,practicalswift/swift,kusl/swift,mightydeveloper/swift,allevato/swift,cbrentharris/swift,tinysun212/swift-windows,IngmarStein/swift,apple/swift,jmgc/swift,hughbe/swift,return/swift,swiftix/swift,russbishop/swift,jopamer/swift,dduan/swift,natecook1000/swift,adrfer/swift,return/swift,tinysun212/swift-windows,djwbrown/swift,russbishop/swift,kentya6/swift,mightydeveloper/swift,uasys/swift,calebd/swift,ahoppen/swift,danielmartin/swift,lorentey/swift,xwu/swift,atrick/swift,mightydeveloper/swift,sdulal/swift,kstaring/swift,allevato/swift,austinzheng/swift,bitjammer/swift,calebd/swift,alblue/swift,hooman/swift,CodaFi/swift,xedin/swift,benlangmuir/swift,calebd/swift,zisko/swift,tardieu/swift,swiftix/swift.old,allevato/swift,tinysun212/swift-windows,danielmartin/swift,cbrentharris/swift,mightydeveloper/swift,ben-ng/swift,khizkhiz/swift,gottesmm/swift,swiftix/swift,hughbe/swift,frootloops/swift,nathawes/swift,JGiola/swift,swiftix/swift.old,mightydeveloper/swift,gregomni/swift,OscarSwanros/swift,xwu/swift,karwa/swift,slavapestov/swift,xwu/swift,xedin/swift,OscarSwanros/swift,xwu/swift,johnno1962d/swift,SwiftAndroid/swift,felix91gr/swift,allevato/swift,tkremenek/swift,LeoShimonaka/swift,kperryua/swift,ken0nek/swift,JGiola/swift,devincoughlin/swift,milseman/swift,slavapestov/swift,aschwaighofer/swift,danielmartin/swift,bitjammer/swift,lorentey/swift,JGiola/swift,jckarter/swift,rudkx/swift,therealbnut/swift,huonw/swift,tjw/swift,natecook1000/swift,glessard/swift,codestergit/swift,xwu/swift,Ivacker/swift,JaSpa/swift,MukeshKumarS/Swift,huonw/swift,gmilos/swift,atrick/swift,frootloops/swift,milseman/swift,allevato/swift,kperryua/swift,jtbandes/swift,gribozavr/swift,tjw/swift,calebd/swift,danielmartin/swift,glessard/swift,slavapestov/swift,slavapestov/swift,austinzheng/swift,ken0nek/swift,OscarSwanros/swift,SwiftAndroid/swift,milseman/swift,devincoughlin/swift,felix91gr/swift,devincoughlin/swift,SwiftAndroid/swift,nathawes/swift,felix91gr/swift,benlangmuir/swift,KrishMunot/swift,kusl/swift,tardieu/swift,IngmarStein/swift,russbishop/swift,amraboelela/swift,kentya6/swift,stephentyrone/swift,kstaring/swift,ken0nek/swift,emilstahl/swift,kentya6/swift,IngmarStein/swift,tkremenek/swift,kperryua/swift,gottesmm/swift,johnno1962d/swift,alblue/swift,swiftix/swift,lorentey/swift,therealbnut/swift,deyton/swift,kusl/swift,xedin/swift,MukeshKumarS/Swift,benlangmuir/swift,SwiftAndroid/swift,karwa/swift,ben-ng/swift,emilstahl/swift,atrick/swift,jmgc/swift,modocache/swift,ken0nek/swift,CodaFi/swift,xwu/swift,kperryua/swift,tinysun212/swift-windows,bitjammer/swift,kperryua/swift,natecook1000/swift,aschwaighofer/swift,tjw/swift,adrfer/swift,arvedviehweger/swift,deyton/swift,russbishop/swift,calebd/swift,JGiola/swift,uasys/swift,karwa/swift,shahmishal/swift,tkremenek/swift,calebd/swift,lorentey/swift,modocache/swift,sschiau/swift,arvedviehweger/swift,shahmishal/swift,codestergit/swift,gregomni/swift,arvedviehweger/swift,harlanhaskins/swift,jckarter/swift,gribozavr/swift,austinzheng/swift,sschiau/swift,emilstahl/swift,tjw/swift