function lastIndexOfimport { lastIndexOf } from "https://dotland.deno.dev/std@0.116.0/bytes/mod.ts"; lastIndexOf(source: Uint8Array,pat: Uint8Array,start?,): numberFind last index of binary pattern from source. If not found, then return -1. Find last index of binary pattern from source. If not found, then return -1. Parameterssource: Uint8Arraysource array pat: Uint8Arraypattern to find in source array optionalstart = [UNSUPPORTED]the index to start looking in the source Returnsnumber