code: func LikelySchemaBlob(buf []byte) bool {
  	if len(buf) == 0 || buf[0] != '{' {
  		return false
  	}
  	return bytes.Contains(buf, bytesCamliVersion)
  }
docs: // LikelySchemaBlob returns quickly whether buf likely contains (or is
  // the prefix of) a schema blob.