tree 320af9030539f4ebad929b7f91a5768f43625341
parent d41c36bf67d6628bccd91697e7f88e55d40d3970
author Roberto Ierusalimschy <roberto@inf.puc-rio.br> 1607007632 -0300
committer Roberto Ierusalimschy <roberto@inf.puc-rio.br> 1607007632 -0300

Avoid "bad programming habits" in the reference system

References were using both 0 indices and nils as values in arrays.
Both do not fit in the concept of a sequence, which is the kind
of use that guides all Lua optimizations.