Function check

packages/db/src/utils/btree.ts:1022–1027

(fact: boolean, ...args: Array<any>)

const ReusedArray: Array<any> = [] // assumed thread-local

function check(fact: boolean, ...args: Array<any>) {
  if (!fact) {
    args.unshift(`B+ tree`) // at beginning of message
    throw new Error(args.join(` `))
  }
}