Add comprehensive documentation for all new functions:
- TakeWhile: take elements while predicate is true
- DropWhile: drop elements while predicate is true
- Scan: running accumulator (prefix scan)
- First/FirstN: get first element(s) safely
- Init: all but last element
- Intersperse: insert separator between elements
- Sliding: sliding window views
- FoldRight: right-to-left fold/reduce
- Tap: side effects without mutation
- Transpose: flip matrix rows/columns
- Unzip: split tuples into separate slices
- ParallelReduce: parallel reduction (experimental)
- Replicate: create n copies of a value
Each doc includes:
- Clear description
- Code examples with output
- Common use cases
- Edge case handling
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Co-Authored-By: Claude <noreply@anthropic.com>
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