src/json-pointer.ts: fix the Flagrate namespace
Modified jsonPointer to create an empty Array for new integer key
typescriptifier: @kanreisa
original: 4d51553311988149a23a77b94f539e51160a2aa3
jsonPointer: for reliability - NOTE: now Flagrate.jsonPointer.set() allows null value and use undefined to delete value.
related: 54772f5059ade6bf1b93fefd71bb7fe831d21ef0
original: 31f0e9af6362538238bb88be7d28f4ae5ebfbc86