bugfix: fixed the error message buffer overwrite in the C API for FFI-based ngx.re implementations.
bugfix: fixes for small string buffer arguments in the C API for FFI-based implementations of shdict:get().
adjusted a test case that could fail on slow machines.
doc: documented the new ngx.worker.pid() API.
refactor: removed an unused parameter, "len", in ngx_http_lua_ffi_script_eval_data.