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In rt-storage, it uses localStorage to broadcast event in different tabs, uses indexedDB to persist data. It is based on localforage and rxjs :
localStorage
indexedDB
localforage
rxjs
Letters make the shortcuts more memorable, because unlike modifiers they can convey meaning. Something like shorthand: gp - Go to projects is easy to memorise, Ctrl+Alt+p (or was it Alt+Shift+p?) can be only remembered after hundred times.