code: func (f *FileStore) Store(ctx context.Context, data io.Reader, size int64, toEncrypt bool) (addr Address, wait func(context.Context) error, err error) {
  	putter := NewHasherStore(f.ChunkStore, f.hashFunc, toEncrypt)
  	return PyramidSplit(ctx, data, putter, putter)
  }
docs: // Store is a public API. Main entry point for document storage directly. Used by the
  // FS-aware API and httpaccess