Document repetition / definition levels more#10101
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mapleFU
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Jun 10, 2026
| /// ├───────────────────────────┼────────────────────────────────────┤ | ||
| /// │ present, with a value │ d >= D │ | ||
| /// │ present but empty (list) │ d == D - 1 │ | ||
| /// │ null │ d <= D - 2 ← "lower still" │ |
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Which issue does this PR close?
Rationale for this change
While reading #9849 I spent some non trivial time reviewing definition and repetition levels and I wanted to encode this knowledge as comments for my future self.
What changes are included in this PR?
Document levels
Are these changes tested?
Doc only, covered by CI
Are there any user-facing changes?
docs only (of internal structures)