Polishing

[EmilianoSanchez]

JavaScript commons library

What did you accomplish?

• Handle possible null conditions and excluded fields in IRBSegment parsing.
• Handle other optional fields, potentially undefined or null.

How do we test the changes introduced in this PR?

Extra Notes

[EmilianoSanchez]

Code review

No issues found. Checked for bugs and CLAUDE.md compliance.

• Type changes are additive (widening conditions and excluded to accept null)
• The parseSegments null guard correctly replaces the destructuring default (= []), which would not have handled null (only undefined)
• Other callers of these fields (AbstractSplitsCacheSync.ts, evaluator/matchers/rbsegment.ts) already use || fallbacks that handle null safely
• Consistent with the null-handling pattern established in PR Handle nullish prerequisites #458

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