lua.wire.fifo.peek
bool = fifo:peek()
bool = thread:peek()
Peek and see if there is a memo to pull but do not pull it.
Note that a pull, even immediately after a successful peek has no guarantee to work.
If you wish to actually look at the contents of the memo then pull a memo and then push it back into the fifo. This will of course change the order of memos in the fifo.