message: add newArray0 that initialize a new buffer from a given size
diff: @@ -9,6 +9,16 @@ export const newArray = (module, b, isZero=false) => {
  return ptr
  }
  +export const newArray0 = (module, len) => {
  + let ptr = module.alloc(len)
  +
  + let memory = new Uint8Array(module.memory.buffer)
  + for (let i = 0; i < len; i++) {
  + memory[ptr+i] = 0;
  + }
  + return ptr
  +}
  +
  export const copyArray = (module, ptr, sz) => {
  const collect = function* () {
  let memory = new Uint8Array(module.memory.buffer);
  