"hello world" is safe?

I tried the library on my server and the first password that came to my mind -- "hello world" -- is marked as "Strong". "helloworld" isn't. I am unsure, maybe it *is* uncommon due to the space, OTOH it is such a common term, wouldn't it be tried early?

Start by reproducing the reported result for "hello world" and "helloworld" with the zxcvbn library, then trace the password-scoring entry point to understand how spaces and common terms are handled. No file or test is named in the issue; done requires a maintainer-confirmed expected classification and a regression test or documented conclusion.

Written by the indexing model from the issue text.