interface SerializeOptionsimport { type SerializeOptions } from "https://dotland.deno.dev/x/web_bson@v0.3.0/mod.d.ts"; PropertiesoptionalcheckKeys: booleanthe serializer will check if keys are valid. optionalserializeFunctions: booleanserialize the javascript functions (default:false). optionalignoreUndefined: booleanserialize will not emit undefined fields (default:true) optionalindex: numberthe index in the buffer where we wish to start serializing into