Fixed up _lockUniqueTimestamp and added @private in its JSDoc.
Fixed up _lockUniqueTimestamp and added @private in its JSDoc.

ExC0d3/Hilary,stuartf/Hilary,timdegroote/Hilary,jfederico/Hilary,nicolaasmatthijs/Hilary,Orodan/Hilary,simong/Hilary,simong/Hilary,mrvisser/Hilary,ExC0d3/Hilary,Orodan/Hilary,mrvisser/Hilary,nicolaasmatthijs/Hilary,timdegroote/Hilary,stuartf/Hilary,jfederico/Hilary