(milli) prefix should not be flagged if it precedes a unit of measurement?

**What got flagged?**

"Use Date objects throughout instead of UNIX (milli)seconds"

**Why is this incorrect?**

- "UNIX" should be in the default dictionary - see #1494
- the "milli" prefix in parentheses before "seconds" should not be flagged

**Example of correct usage:**

"Use Date objects throughout instead of UNIX seconds or milliseconds"

Start by reproducing the quoted sentence, including “UNIX (milli)seconds,” and locate the rule that flags the parenthesized prefix. Check the related #1494 discussion for the expected UNIX dictionary handling. Done means the prefix is not flagged before “seconds” and the example passes with the intended dictionary behavior.

Written by the indexing model from the issue text.