fix(observer-locator): differentiate array observer storage from length prop storage
fix(observer-locator): differentiate array observer storage from length prop storage

z-brooks/binding,cmichaelgraham/binding,jods4/binding,shanonvl/aurelia-binding,mbroadst/binding,JeroenVinke/binding,behzad88/binding,hitesh97/binding,davismj/binding,bigopon/binding,jdanyow/binding,aurelia/binding