possible doc/behavior error of patterns

["szbnwer@..." <szbnwer@...>]

hi folks! :)


i get:
```
hippi@vas:~$ lua5.3
Lua 5.3.3  Copyright (C) 1994-2016 Lua.org, PUC-Rio
> print(('aaa x bbb'):match'(.-) x (.*)')
aaa	bbb
```
(lj 2.0.5 does this as well)

i would expect that the 1st capture should be empty without a `^` at
the beginning of the pattern, as the manuals (up to lua 5.4) say:
"a single character class followed by '-', which also matches zero or
more repetitions of characters in the class. Unlike '*', these
repetition items will always match the shortest possible sequence;"

am i wrong here?

(((actually it came from here:
https://github.com/moonjit/moonjit/blob/v2.1/src/jit/p.lua#L88 )))


thx for any info and all the bests to all of u! :)