LuaJIT FFI: char[?] initialization from string

[Florian Weimer <fw@...>]

This:

| local ffi = require "ffi"
| print(string.byte(ffi.string(ffi.new("char[3]", "ABC"), 3), 1, -1))

prints:

| 65      66      0

I think this is rather surprising.  I would have expected:

| 65      66      67

Is this a bug or a feature?